7 Best Running Shoes in 2025

Jens Jakob Andersen
Jens Jakob Andersen on
7 Best Running Shoes in 2025

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Are you looking for a comfortable all-arounder? A supportive shoe for overpronation? Or a speedy racer for a new personal best? There is no ONE best shoe for everybody.

We ran in these running shoes and tested them in our lab to help you find the best pair. See our highly recommended models in several categories below.

And if you want to learn more about choosing the right running shoe, scroll down to our in-depth guide.

How we test running shoes

We focus on delivering objective running shoe reviews, and we're able to do that because we not only run in the shoes but also twist them, fill them with smoke, cut them in half, put them in the freezer, and perform dozens of standardized tests in our lab.

Here's what our workflow looks like:

  • As an independent shoe testing lab, we purchase all shoes with our own money to stay unbiased.
  • We run in the shoes and make sure that we vary our runs from roads to trails and from recovery runs to sprints before submitting our in-depth reviews.
  • We cut shoes into pieces and measure over 30 parameters on shock absorption, energy return, traction, durability, breathability, stiffness, stack heights, platform width, insole thickness, and more. 

Best running shoes overall

ASICS Novablast 5
92
Superb!

What makes it the best?

The Novablast 5 stands out in the all-rounder game, bringing a whole new level of comfort while sustaining stability, responsiveness, and reliable durability. Novablast 5 repeatedly excels in our lab tests and outdoor runs, rightfully claiming its throne as the ultimate running shoe.

Indulging in this shoe is an absolute delight. The ultra-stacked 40.9/33.5 mm midsole is our main star as it oozes divine levels of comfort for double-digit miles. Our durometer confirmed our sensations, as it measured 38.4% softer than average. Despite its plush nature, the cushion brings out a vibrant ride for faster days.

Our runs feel stable regardless of our pace. Novablast 5 offers an extra width of 8.3/6.9 mm in the forefoot and heel to ensure we land securely no matter our foot strike. We can run mindlessly as the midsole flows with our movements. Our scales confirm it’s a light 9.0 oz (254g) while our flex test validates it’s 32.2% more adaptive than average.

Novablast 5 proves its durability as the midsole had minor creasing and the outsole barely had scratches after long miles of running against hard pavements. We didn’t feel any difference in terms of performance, showing it’s a reliable and long-lasting running partner.

However, its shine fades on wet pavements because of its lack of traction. Those who prioritize relentless grip should look elsewhere.

Pros

  • Improved energy return with FF Blast MAX foam
  • Plushiest foam in a Novablast yet
  • Keeps the same price as v4
  • Higher stack height for extra cushioning
  • Enhanced flexibility
  • Lighter than its predecessor
  • Best Novablast ever for wide feet
  • Exceptional weight-to-cushion balance
  • Works for short, medium and long runs

Cons

  • Breathability could be improved
  • Toebox durability
Full review of ASICS Novablast 5

Best daily training running shoes

Nike Pegasus 41
88
Great!

What makes it the best?

The Pegasus series did not disappoint with its 41st version, dropping the ultimate daily trainer that both newcomers and seasoned runners will appreciate alike. It maintains its liberating ride in our runs and comes out with an all-new ReactX foam that’s both plush and energetic. Plus, our lab confirms its upper is the perfect blend of comfort and breathability.

One of Pegasus 41’s highlights lies in the midsole design. Boasting two Air Zoom units nestled within the ReactX foam, it launches our toe-offs with ease and catches us with gentle landings. As confirmed by our durometer, it’s 26.2% softer than average.

The shoe is bendable in all directions, which keeps the pleasant natural running experience. As proven by our bend test, it is 34.0% more flexible than average. Even twisting the shoe in our manual assessment felt effortless with its 2/5 rating.

Even the upper felt liberating with its unhampered airflow, which we found quite surprising given its soft touch and dual-layer mesh. True enough, our smoke test highlights its impressive ventilation with a 4/5 breathability rating.

However, Pegasus 41 has a steep 11.4 mm drop which may feel too harsh for mid-to-forefoot strikers. We believe this pair is more suitable for heel strikers.

Pros

  • Enhanced for heel strikers
  • New ReactX foam!
  • Improved breathability
  • Plush upper
  • Good durability
  • Several stability enhancements
  • Newly designed rocker and bevel
  • Solid performance
  • Superior lockdown
  • Sustainable features

Cons

  • Not ideal for forefoot strikers
  • Price increased by $10
  • Worse than the v40 in cold temperatures
  • Poor grip
Full review of Nike Pegasus 41

Best stability running shoes

What makes it the best?

The ASICS Gel Kayano is known as a top-stability running shoe, and the 31st version is no different. Backed up by our road runs and lab tests, it seamlessly blends plush comfort and steady support into one—qualities that boost our confidence and happiness like no other.

The GK31 integrates subtle elements to guide our foot alignment. The main star is the 4D Guidance System, which is composed of soft foam under our arch to deliver custom support to each unique individual. Additionally, the shoe has sidewalls and a vast landing base that secures our landings safely. Our jaws dropped at the mega 122.1/97.6 mm midsole vs. the 113.8/90.5 mm average, making it almost impossible to lose our balance.

Moving to the cushioning, it impressed us greatly with the heavenly comfort it delivers. Not only is the heel extra high at 39.3 mm, but it also includes the PureGEL technology to create pillowy landings. Our durometer confirms our sensations when it emerged 27.1% softer than average.

Another standout feature is its natural feel, a rare sighting for stability shoes. Our flex test shows it's 14.4% more malleable than average, allowing us to move freely with barely any resistance.

However, its heavy weight of 10.4 oz (295g) confirms it’s truly a stability maximalist shoe. Those who prefer lighter options can find other streamlined stability shoes.

Pros

  • Excellent stability
  • Ideal for heel strikers
  • Good breathability
  • Comfortable and roomy upper
  • Great for easy paces
  • Maximalist cushioning
  • A bit lighter than v30
  • Plush FF Blast+ foam
  • Superb traction

Cons

  • Big and clunky
  • Not versatile at all
Full review of ASICS Gel Kayano 31

Running shoes with the best shock absorption

What makes it the best?

The Mizuno Neo Vista 2 offers next-level comfort with its skyscraper stack and leg-saving properties. Through extensive testing in the lab and repetitive pounding on the pavement, we confirmed its excellent joint protection and smooth ride, rightfully claiming its title as the running shoe with the best shock absorption.

As we effortlessly log miles, the Neo Vista 2 erases any harshness of landing impact, courtesy of its gigantic 46.0/37.5 mm stack height. It tops the charts in terms of height and impact protection! In our shock absorption test, it scored 170 SA in the heel and 137 SA in the forefoot, the highest we’ve recorded so far.

We melted into the midsole's forgiving and refreshing ride. Despite its thick stack, it surprisingly feels light and effortless. Our scales confirm it weighs 9.3 oz (264g), at par with the average and lower-stacked shoes. Plus, it emerged 10.0% more malleable than average in our bend test.

However, the midsole felt uninspiring, which shows Neo Vista 2 prioritizes comfort over performance. Those looking for a trainer capable of faster efforts should try other options.

Pros

  • Massive stack height
  • Super-plush Enerzy NXT foam
  • Perfect for long runs
  • Lightweight for its huge size
  • Good durability
  • Breathable knit upper
  • Roomy toebox height
  • Insanely fun!

Cons

  • Not enough energy return
  • Price hike feels unjustified
  • Not stable for heel strikers
Full review of Mizuno Neo Vista 2

Best race running shoes

Nike Vaporfly 4
89
Great!

What makes it the best?

After going through hundreds of shoes in the lab, the Nike Vaporfly 4 caught our attention as the ultimate racer, perfect for PB chasers. During runs, it ignited our every stride without overlooking the comfort required for longer races. With its unmatched energy and lightness, we unleashed speed like no other.

We’re amazed how V4 managed to keep its build at an ultra-light 5.6 oz (166g) with all its features. For reference, its plated counterparts average 7.3 oz (208g). Regardless of foot strike, we have tons of impact protection and boundless energy from the soft 19.9 HA ZoomX midsole.

V4 elevates its FlyPlate in the forefoot by making it spoon-shaped to encourage faster leg turnover. This helps sustain our speed with less effort. It releases power through its insane stiffness, which our bend test shows is 14.6% more, and therefore snappier, than average. We felt that V4 shined best at our race pace.

The upper is a summer runner’s dream, allowing air to flow in and out freely while providing protection. On our breathability and Dremel tests, it earned a remarkable 4/5 in both tests—no need to worry about hotspots, sweaty feet, or torn uppers.

However, its reduced stack height vs. previous versions makes it less suitable for heavier runners. Those who need more cushioning will not be satisfied with this pair, especially for marathon distances.

Pros

  • 13% lighter than the Vaporfly 3
  • Awesome for 5K, 10K and 21K races
  • Full ZoomX midsole
  • Spring-loaded carbon-fiber Flyplate
  • Fantastic lockdown with premium laces
  • Moderate rocker for a more natural ride
  • Improved perforated, removable insole
  • Better rubber coverage in the forefoot
  • Gets improvements from the Alphafly 3
  • Great upper featuring breathability and durability

Cons

  • Less ideal for marathon racing
  • Still lacks the snappy feel of the Vaporfly 1&2
  • Narrow midfoot and heel limit stability
Full review of Nike Vaporfly 4

Running shoes with the best energy return

What makes it the best?

We've seen it all in the lab after testing hundreds of shoes, but the Endorphin Elite 2 still managed to surprise us in a big way. It’s not the best all-around supershoe, but the new ultra-soft foam creates a mind-blowing running experience. Sure, the price is steep and its lack of stability can be risky, yet we believe the fun and performance it delivers is worth it. In fact, Saucony has crafted a wild supershoe no one else has dared to make... until now.

Pros

  • Record-breaking energy return
  • Ultra-plush foam
  • Fantastic shock absorption
  • Addictively bouncy and fun feel
  • Ideal for the marathon distance
  • Durable and breathable upper
  • Improved lockdown with knit tongue
  • Stack height maxes out the legal limit
  • Explosive, forward-driving ride

Cons

  • A touch heavy for being an elite supershoe
  • Budget-crushing price
  • Lateral stability is extremely bad
  • Lacks specific support for heel strikers
Full review of Saucony Endorphin Elite 2

Running shoes with the best traction

What makes it the best?

ASICS revamped the Nimbus series with the 25th edition, and by the 27th, it’s all about refinement. In our lab tests, we found it remains a high-cushioned daily trainer made for comfort-focused runners. Its ultra-thick midsole provides a stable, shock-absorbing ride, but the bottom-heavy feel and firmer foam may not appeal to everyone. In our view, it’s still best suited for easy miles, lacking the versatility for varied paces. And while the price increase isn’t drastic, it might not sit well with regular Nimbus buyers.

Pros

  • Even more foam underfoot!
  • Premium-feel, breathable upper
  • Fantastic stability
  • Improved toebox with extra wiggle room
  • Flexible knit tongue
  • True maximalist comfort for recovery runs
  • Amazing heel lockdown
  • Top-tier grip

Cons

  • Feels bulky and heavy
  • Minor price increase
  • Lacks energy return
Full review of ASICS Gel Nimbus 27

There is no ONE best running shoe

All feet are unique and even some of the best-rated running shoes might not work for you specifically.

choosing-best-running-shoes.jpg

But the good news is that the running footwear market is so saturated that you are sure to find a shoe that would feel tailor-made for your feet!

In this guide, we break down the most important considerations to help you narrow down the choices and find that perfect pair.

Where to start: road vs. trail running shoes

This one is simple: If you mostly run on asphalt, tarmac, treadmill, 4x4 road, or even major forest trails or the likes, then buy road running shoes.

Only buy trail running shoes if you run on single trails or off trails. Otherwise, you don’t need them.

Road running shoes

Hoka-Bondi-8-heavy-weight

Some road shoes can also be used for light-to-moderate trails. Just make sure that they have thick and sturdy rubber outsoles.

Outsole durability shows how deep was the damage caused by 22 seconds of drilling the shoe’s rubber with a Dremel at 10K RPM speed.

Trail running shoes

nike-pegasus-trail-4-outdoor_006.JPG

You should not be afraid to run on roads with your trail running shoes once in a while. Quite often, you’d need to run up to a mile before you get to your nearest trail, and that is not a problem. However, we recommend that you keep it at a minimum as feet and knees can start to hurt.

The bigger the lugs, the sooner your feet will start hurting. For road-to-trail shoes, lugs below 3 mm are best.

If, on the other hand, you mostly run off trails, in the wild, with mud caking up under your feet within minutes, you must get a trail shoe with deeper lugs. They will keep you surefooted by biting into the ground more aggressively. They also tend to be more spaced-out to shed off the mud while running.

Salomon Speedcross 6 Lug depth
We use a caliper to measure lug depth on every running shoe.

Key differences between road and trail shoes

road-vs-trail-running-shoes.jpg
Saucony Ride (road shoe) vs. Saucony Peregrine (trail shoe)

Outsole: Road shoes have flatter and pavement-ready soles. Trail shoes have lugs (tread patterns), for better traction on uneven terrain.

road-vs-trail-outsole.jpg

Protection: Most trail shoes are equipped with rugged toe bumpers and rock plates to keep the runner’s feet protected from various terrain challenges.

Nike-Pegasus-Trail-3-Toe-Bumper.jpg
Toe bumper on Nike Pegasus Trail

Weight: Because of the added ruggedness and protection, trail shoes are on average an ounce heavier than road shoes.

nike-pegasus-road-vs-pegasus-trail.jpg

Upper: Road shoes have lighter, more breathable uppers because road races don’t have any obstacles. Trail shoes are reinforced with various protective elements, including additional layers in high-wear areas, which makes them less breathable.

road-vs-trail-shoe-upper.jpg

Based on our in-house ventilation tests, the average breathability score of road shoes is 4 out of 5, while the average of trail shoes is 3 out of 5.

Use: The most important factor

A beginner-friendly trainer is going to be vastly different from a carbon-plated marathon race shoe. Let’s take a closer look at the main running shoe categories based on their intended use.

Daily running shoes (also best for beginners and daily wear)

Well-cushioned and comfort-loaded, daily trainers make up the majority of running shoes on the market. This is where you find that go-to daily beater that never fails.

Hoka-Bondi-8-review

We highly recommend shoes from this category to beginner runners as they meet the following criteria:

  • well-cushioned (at least 30 mm of heel stack)
  • average heel-to-toe drop (8-14 mm, ideal for a beginner’s heel-striking pattern)
  • balanced softness (neither too firm nor mushy)
  • no carbon plates or aggressive rockers
  • MSRP of $140 or less

Can you wear daily running shoes for everyday use? Absolutely! The characteristics mentioned above make this footwear category ideal for spending long hours on your feet.

Some daily trainers have features of speed-oriented shoes. These are more expensive but let you have two pairs in one.

Tempo/speed training running shoes

Lighter than daily trainers, this category is better equipped for picking up the pace or even setting a new speed record. 

Hoka-Mach-5-review

The average weight of tempo shoes is 2.4 oz (68g) lighter than the average of daily trainers!

  Daily trainers Speed trainers
Average weight 10.0 oz (283g) 7.6 oz (216g)

Tempo training shoes also tend to have bouncier foams and springier rides. Some of them even use stiff carbon plates for added propulsion. You can learn more about how plates work in our extensive research.

Some speed trainers can also be used for daily training or even competitions.

Race/competition running shoes

This is where you find the world-record-shattering Nike Vaporfly’s and Alphafly’s, Adidas’s buzzworthy $500 Evo 1, among other iconic shoes.

The lightest of running shoes (7.5 oz/213g on average), these racers feature the brands’ most cutting-edge technologies to help you achieve the most efficient performance.

For professional runners, choosing the perfect race shoe gets even more complicated. But it is our mission to help you sort that out. Explore our meticulous guides on foams, carbon plates, rockers, and shoe uppers to get more insights.

Consider the distance as well

A 5K/10K race calls for a much faster pace than a marathon. Your best companion here is a light and springy trainer. Depending on your preference, you can choose between a classic minimally cushioned flat and a super soft and plated maximalist shoe.

Going for a marathon or even an ultra marathon? Make sure you're packed with plenty of cushioning, lasting underfoot support, and a perfect fit.

Some super shoes are so versatile, they can be effective for both 5K and 42K.

Cushioning and ride in running shoes

That slab of foam in between your foot and the ground is what ultimately makes or breaks a running shoe. Getting the following parameters right will guarantee your comfort and best performance:

  • stack height
  • heel-to-toe drop
  • foam softness
  • presence of a carbon plate
  • presence of a rocker

Stack height in running shoes

Stack height refers to the amount of material in between your foot and the ground. We cut each tested shoe in half in our lab to measure its heel and forefoot stack heights following the rules set by World Athletics (at 12% and at 75% of the inside length of the shoe). 

Forefoot and heel stack height

For beginners, we recommend going for heel height in the 28-35 mm range. These shoes are neither too flat (low to the ground) nor too high.

If you need tons of cushioning, go for the 35-40 mm range. Keep in mind that 40 mm is the maximum heel stack allowed for competitions by the World Athletics. Anything above means disqualification.

Adidas Adizero Adios Pro 3 Heel stack

Some seasoned runners also prefer to go down the minimalist and even barefoot path. These shoes have a heel stack of 20 mm or less and require an adaptation period as they activate different biomechanics.

Merrell Vapor Glove 6 Heel stack

Still not sure which one to choose? We have developed a tool to help you find out which stack height is perfect for your running needs.

Heel-to-toe drop in running shoes

If you’re new, or if you run less than 10 miles per week, there’s no need to know about heel-to-toe drop as long as you buy shoes with at least 6 mm drop (preferably 8-12 mm).

Altra Paradigm 7 Drop
Example of a low drop shoe (0.1 mm)
Brooks Ghost 15 Drop
Example of a high drop shoe (13.2 mm)

The only exception is if you have a record of severe ankle, knee, hip, ITB, Achilles, or plantar fasciitis injuries. In such cases, seek out a specialist before buying running shoes.

More experienced runners tend to show interest in the heel-to-toe drop. There are a lot of opinions on the subject. If you want to learn more, check our in-depth scientific guide to heel-to-toe drop.

Heel drop effects

Low

low-drop.png

High

high-drop.png

The lower the drop, the greater the potential to improve cadence. Foot switch is slower in higher drop shoes.
Lower and zero drop shoes promote midfoot and forefoot strike. A higher drop allows for rearfoot strike because the elevated heel helps with high impacts when the heel hits the ground.
Lower heel drop might help with ITB, (anterior) knee pain, gluteal overuse syndrome. Higher heel drop might help with plantar fasciitis, Achilles tendinopathy (stiff Achilles), calf injuries.
Low drop shoes allow for more ankle flexion during landing. The ankle absorbs the impact and works as a spring. These shoes can place greater stress on the foot, ankle, lower leg. High drop has a higher knee flexion moment. This means it has the potential to load hips and knees more, similar to heel strike.
Overstriding rearfoot strike might be prevented with a lower drop. Overstriding forefoot strike might be prevented with a higher drop.

Foam softness

As a beginner runner, you want a balanced type of cushioning that's neither too plush nor firm. These shoes also work for most runners, walking a fine line between comfort and performance. This type of cushioning is used in the "workhorse" shoes used for daily running, tempo runs, and racing.

Altra Provision 7 Midsole softness

To help you know exactly how soft each running shoe is, we use an HA durometer in our lab to measure foam softness. The lower the number on the tool, the softer the foam. The average durometer measurement for running shoes hovers around 25 HA.

Softer shoes offer maximum impact protection and are usually high-stacked. They are best for long runs, recovery runs, marathons, and ultras.

Example of a very plush foam (9.8 HA)

Lower-stacked and aggressive-looking, firmer shoes are best for quick transitions. Studies show that greater midsole hardness in running shoes results in shorter contact time. But keep in mind that there is much less shock absorption here than in soft shoes. On the bright side, firmer shoes tend to be stable enough to double as gym shoes.

Example of a very firm foam (34.4 HA)

If you want more data-backed insights into choosing between soft and firm cushioning, see our in-depth guide on the topic. Especially if you're wondering how shoe foams behave in the freezer!

Carbon-plated running shoes

If you are a beginner runner, we recommend staying away from carbon-plated shoes for now. These shoes are most beneficial for races and tempo training as they are intended for maintaining faster paces.

First introduced in the Nike Vaporfly in 2016, carbon plates changed the running shoe game forever. Since then, every men's and women's record on every distance has been broken by runners wearing plated shoes.

At least 5% of running shoes on the market today feature some variation of a plate.

Nike Vaporfly 3 Drop
A carbon plate inside the Nike Vaporfly 3 (the black piece running through the midsole) 

A stiff carbon plate is sandwiched inside the midsole to add propulsion upon take-off. Kind of like a swimming pool springboard.

We dive deeper into the topic of carbon-plated shoes in our extensive guide backed by science and our own lab findings.

What is arch support and why it matters 

If you've never heard about arch support, your ankles don't collapse inwards, and shoes don't have a tendency to wear out more on the inner side, then you can probably skip this section.

Asics Gel Kayano 30 4D Guidance
Example of a shoe with arch support (ASICS Gel Kayano)

Arch support is only necessary when you have flat feet, overpronation, or other foot conditions that call for supportive components in running shoes (like plantar fasciitis). Running shoes with stabilizing technologies are also called stability shoes.

You can see the difference in foot and ankle stability between a neutral shoe (above) and a stability shoe (below) in our lateral movement test.

Here are a few rough guidelines: 

To determine pronation, look at your used footwear - do you wear them evenly? If they’ve been worn more on the outer sides, you’re underpronating. If they’ve been worn more on the inner sides, you’re overpronating. Even wear means neutral pronation.

new-pronation-comparison-chart-runrepeat.jpg

If you want to know everything about arch support in running shoes, you must check out our in-depth guide.

Before we can recommend a stability running shoe, we perform a series of tests and measurements to assess its supportive capacity:

  • torsional stiffness (higher rigidity = better support)

  • heel counter stiffness (higher rigidity = firmer heel hold)

  • midsole width (extended contact points prevent the foot from rolling over)

Asics Gel Kayano 30 Midsole width in the forefoot

Choosing the right size and fit in running shoes

If it's been a while since you last purchased a running shoe, we highly recommend measuring your foot length from scratch.

Too busy for that? Grab an athletic shoe that fits you the best and enter its CM or MM size (i.e. 260, 265, etc.) into this shoe size converter.

New Balance Fresh Foam X 1080 v13 upper fit

Going with the shoe size you think you have is a risky strategy, as every brand has a different size chart. Even within the same brand, the right size for you may vary from one model to another.

So once you have your precise foot length measurement, do consult the corresponding brand size chart.

New Balance Fresh Foam X 1080 v13

In addition to size (length), you must also consider your future shoe's fit. It must not be too tight or too loose around your heel, midfoot, or forefoot. Unfortunately, it's hard to gauge the first two when purchasing online, but we can help with the toebox fit!

To get accurate measurements of the toebox, first, we make a gel mold of the shoe's interior. We do it by pouring our special gel into the shoe and freezing it with the shoe

Once the gel has hardened, we take the gel mold out of the shoe and start measuring. 

big-toe-width-gel-best-running-shoes.jpg
Measuring the width of the toebox at the big toe. When a toebox is very narrow here (while medium or wide where it's the widest), it means it's a very pointy toebox and runners' toes may get cramped in it
toebox-width-gel-best-running-shoes.jpg
Measuring the width of the shoe where it's the widest. Runners with bunions should look for shoes that are (very) wide in this area 

Having both measurements allows us to convey the entire toebox shape as some shoes can be wide enough at the metatarsals but taper aggressively towards the front.

Given that the volume of the feet is not about width only, but also height, we cut our gel mold in half and measure the toebox height. 

toebox-height-gel-best-running-shoes.jpg
Measuring the height of the toebox in RunRepeat lab 

For more nuances on the fit of running shoes, see our guide on choosing the right toebox

Consider breathability and waterproofing

A vast majority of running shoes are made with breathable mesh uppers which keep the feet fresh. Based on our smoke-pumping machine tests, 60% of running shoes have high breathability scores of 4-5 out of 5.

We assess ventilation by the amount of smoke that escapes through the upper fabric. We then also hover the shoe's half-cut upper over the light to see where most ventilation pores are concentrated.

Waterproof shoes are needed in very rare cases. Only if you regularly run in rainy weather, puddles, slush, and low temperatures. Or if you have multiple creeks or streams crossing your trail. There is a good reason why only 7% of running shoes in our catalog are waterproof.

For winter, you might be just fine getting a non-waterproof pair with a lower breathability score of 1-3.

Author
Jens Jakob Andersen
Jens Jakob Andersen
Jens Jakob is a fan of short distances with a 5K PR at 15:58 minutes. Based on 35 million race results, he's among the fastest 0.2% runners. Jens Jakob previously owned a running store, when he was also a competitive runner. His work is regularly featured in The New York Times, Washington Post, BBC and the likes as well as peer-reviewed journals. Finally, he has been a guest on +30 podcasts on running.