Humans were born to dive, according to some scientists, and that fact helps us thrive at high altitudes

A wilderness medicine expert and former AT thru-hiker shares her tips for tackling a long-distance backpacking trip

Pretty much every elite endurance athlete trains in mountain air or the altitude-tent equivalent. But a few scientists think they're wasting their time and money.

The simple story of an unfair shoe with “springs” doesn’t capture the true complexity of the ongoing debate about technology in footwear

A new study finds unexpected benefits from super-short intervals with even shorter recoveries

Scientists are increasingly skeptical of the benefits of flexibility, but the fitness world doesn’t want to hear it

When Rebecca Mehra tried to unplug a broken oven, she almost ended her track season—or worse

New research hands down verdicts on what to lift, how much, and how hard

Heat training has been hyped as a powerful workout enhancer, but new research sounds a note of caution

Researchers deploy machine learning to match running styles to the risk of different types of injury

To better push your limits, try swearing off some of your most familiar crutches now and then

Improving your max aerobic power may come at the cost of worse efficiency, a new study finds

Up-to-date guidelines on the pros and cons of filters, ultraviolet light, chemicals, and other options

To train athletes to truly push their limits, it helps to draw inspiration from the French social theorist Michel Foucault. Seriously.

Great titles for the endurance-curious, or to curl up with yourself

Platelet-rich plasma therapy, or PRP, has been touted as a miracle cure for sports injuries, but it may counteract the benefits of plain old rehab exercises

A new analysis tracks people doing 35 hours of exercise per week for a decade, and finds no evidence of heart risks

Scientists can forecast marathon performance fairly accurately. But for longer distances, things get complicated.

All-out sprint speed may seem irrelevant in longer events, but new science is making the case for having a “speed reserve”

At a conference on sports innovation, sleep scientist Charles Samuels cuts through the hype

The Swedish company Maurten's hydrogel drink has taken the endurance world by storm over the last two years. Now scientists are testing their claims.

Over the past decade, athletes, coaches, and researchers have been seduced by the performance-boosting promises of brain stimulation. On a ride-and-zap-your-brain-like-the-pros tour through the Alps, Alex Hutchinson wonders whether it really works—and whether we want it to.

The two-hour barrier and the women’s marathon world record both fell this weekend. The history makers, Eliud Kipchoge and Brigid Kosgei, have one obvious thing in common.

A new study quantifies the time gained and lost from the geography of the INEOS 1:59 Challenge course, and suggests that you don’t need to sweat the curves

Crunching the data suggests that distance runners at this year’s track world champs paced more aggressively than ever

Delayed gratification gets harder when you’re overtrained, according to a new brain-scanning study

A handful of new products are claiming they can. The jury's still out on whether they deliver enough of an edge to justify the agony.

New evidence bolsters the claim that adapting to hot weather gives an all-around fitness advantage—but not right away.

Whether you’re striving for peak performance or coming back from injury, psychological techniques can help

Some key takeaways on hydration, power meters, recovery, and menstrual period tracking

Two new studies on beet juice and VO2max highlight the limitations of sports science research that excludes female athletes

Figuring out how long, how often, and when to train in the mountains remains an art for endurance athletes

The physiological and psychological responses to different types of interval workout depend on the details

A historical analysis of world-record pacing suggests that beating your own best time can be complicated

A study that assigns different workout plans to each leg shows just how much (or little) the details matter

Scientists debate the physiological benefits of ramping up your training intensity or your training volume

You have to work hard to build strength, but that doesn’t necessarily mean collapsing to the floor after each set

A pair of presentations explore the biomechanics of the controversial shoe, and whether it wards off marathon-induced muscle damage

The theory makes sense, but actually showing that “hyperoxic training” makes you faster remains a challenge

A new study finds that your “critical speed” threshold drops in the last third of a marathon, which may explain why the distance produces so many blow-ups

A simple self-test zeroes in on the most efficient stride rate for your running style

A new study looks at the effect of subtle wording changes on the performance-boosting power of motivational self-talk

Experts from the Wilderness Medical Society have combed through the evidence to assess what works and what doesn’t

Staying healthy is crucial to athletic performance, and a new analysis from the 2018 Olympics suggests some surprising defensive tactics.

A lactate-munching microbe found in the poop of Boston marathoners is interesting, but that doesn’t mean you should (ahem) swallow it just yet

Analyzing your training distribution can reveal the right balance between hard and easy workouts

A newly published scientific case report documents the rise (and fall) of cycling phenom Oskar Svendsen

The mental side of soreness, the downside of ice baths, and the genetics of tendon injuries were hot topics at this year’s ACSM conference

Hydrogels, electrolytes, and drink frequency top the list at this year’s ACSM conference

Insights from this year’s ACSM conference on how to lift, what to eat, and how that affects endurance athletes

A new study of transcontinental racers pegs the digestive tract as the limiting factor in extreme feats of sustained endurance

We won’t tell you what to think; we’re just here to share the latest data.

Connective tissue is notoriously slow to heal. New research suggests gelatin might help.

Data from the last world championships suggests you shouldn’t be concerned about your foot strike, no matter how you land

The thresholds that define low iron can be different for athletes compared to non-athletes

It’s not a miracle, and it’s not a secret, but the link between fitness levels and the risk of lung and colorectal cancers is impressively strong

The real magic of much-hyped ketone supplements, according to Belgian scientists, is how they enhance recovery

New evidence suggests that strengthening your respiratory muscles can translate to improved performance in thinner air

Use the calculator below to try out a new equation developed by the military to estimate energy expenditure while hiking

New research suggests that a month of probiotic supplementation reduces GI symptoms in runners

The popular self-massage devices have a devoted following, but the evidence for their benefits is murky

Before his controversy-plagued doubled ascent in 2017, the Spanish ultra star deployed the latest altitude science to speed his high-altitude adaptation

To counteract caffeine tolerance, new research suggests you need to swear it off temporarily

A study of the cognitive and psychological effects of outdoor cycling finds equal results for normal bikes and e-bikes

In a new study, mountain hiking had similar psychological and stress-reducing benefits whether or not there were signs of human habitation

A simple questionnaire assessing self-regulatory skills—planning, self-monitoring, evaluation, reflection—offers clues about who will push themselves to a sports injury

Yes, the physiology and biomechanics of treadmill running are a little different. But how you feel about it is probably more important.

The hype around the technology has raced ahead of the evidence. Now the evidence may be catching up.

Researchers dig into the nitty-gritty of interval training, with insights of what, why, and how you should train for different goals

A new statistical approach brings sophisticated probability analysis to the future of marathoning

Scientists are untangling why it’s easier to regain fitness than to start from scratch

New research parses the different effects of exercise on anger as an emotion versus anger as a mood

A new model reinterprets those pretty graphs that seemed to show minimalist shoes reducing impact forces

A push-up test outperformed a treadmill test for predicting cardiac health—but it’s not all about your pecs

The evidence in support of carbohydrate drinks is flimsier than you might think—which is why the results of a new study are worth paying attention to

When it comes to the effects of temperature on performance, perception is reality

The benefits of beet juice seem to be weaker in trained athletes. They just need more of it, a new study suggests.

A new multi-study review finds no advantage to following a hydration plan compared to simply drinking when you feel like it

A detailed analysis of historical Boston results wades into the long-running debate on sex differences in endurance