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Running 101

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How to Build Volume Heading Toward Summer Race Season

Coach Stefanie Flippin dives into how to safely build higher running volume as the spring and summer trail running season quickly approaches

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Running with Your Dog Is Good for Your Health, According to Science

Running with your dog offers great health benefits for you and your four-legged friend. Here's what we know.

Marathon Central

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How and Why You Should Mix Up Your Long Runs

If you’re looking to add some zest to your weekend long run, we’ve got just what you need with workouts from champion runners and coaches


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Get off the beaten path, and stay found.

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Discover the best trails in the world.

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Outside TV

Unlock 600+ hours of ad-free films and series.

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Unlock 15+ outdoor publications all in one app.


The Shoes That Ruled Boston

These Are the Shoes That Ruled the 2024 Boston Marathon

After Adidas and On claimed victories, Nike, Asics, Puma and Brooks were the other top brands

Now that Hellen Obiri and Sisay Lemma have etched their names in the Boston Marathon history books, there’s one outstanding question everyone wants answered: What were the fastest shoes in the 2024 Boston Marathon?

Obiri won her second consecutive Boston title wearing a pair of On prototype shoes called the Cloudboom Strike LS Dev 1.2. It’s a shoe that’s been vetted and approved by World Athletics, but On isn’t saying much about it except that it’s keeping it top secret for now. It seems to be a maximally cushioned shoe which presumably has some sort of supercritical midsole foam and a carbon fiber propulsion plate. But the most striking feature is what appears to be a stretchy knit laceless upper.

Obiri won both the Boston Marathon and the New York City Marathon in 2023 wearing a pair of prototype shoes On has called the CloudTri 1. But that shoe, which was also approved by World Athletics, hasn’t yet become commercially available.

While that was certainly the most intriguing shoe of the race, the most prolific was the Adidas Adizero Adios Pro Evo 1. The ultra-light carbon-plated white and black racing shoe was worn by men’s champion Sisay Lemma (2:06:17), as well as fifth-place finisher Albert Korir (2:07:47) and women’s fourth-place finisher Buze Diriba (2:24:04).

In all, three of the top nine men wore that shoe, as well as six of the top 20 women. Somewhat surprisingly, two-time defending Boston Marathon champion Evans Chebet didn’t wear the shoe, instead opting for a pair of Adidas Adizero Adios Pro 3 that helped him win the race in 2022 and 2023, as well as the 2022 New York City Marathon.