Fitness

As peptide “stacking” takes over social media feeds, we separate the science from the hype of the Internet’s latest wellness obsession

Researchers say that President Donald Trump’s resurrection of widely maligned fitness testing in schools is “half-baked” and unlikely to move the needle on youth physical activity alone

The Internet loves fitness-motivation content. Olympian and researcher Valerie Gruest explains why it can be so harmful

A sub-two-hour marathon has long been seen as a tantalizing benchmark for elite runners—and shoemakers have been in a race to design footwear that can help them get there

The world of peptides has exploded in wellness circles, but the benefits of injecting these gray-market molecules rest on little clinical evidence

Creatine does help build muscle, but social media claims for methylene blue dye are way overblown

VO₂ max is an important measure of aerobic conditioning, whether you’re an Olympian or just a person hoping to stay healthy

Researchers found that walkable city design—not personal motivation—was the key factor behind people taking 1,100 more steps per day

New research suggests that getting even just a few more minutes of sleep and exercise and eating an extra cup of vegetables every day can significantly boost longevity

Motion is the new potion, and rest is no longer the best

Milliseconds of variability, now detected by fitness watches, can improve well-being

Scientists look to genetics to explain why GLP-1 drugs work for some people but not for others