Below are some of the reasons your size fluctuates.

Jeff Dengate and Aly Ellis talk about training for winter half marathons and why they're a great excuse to book a tropical ...

Three cast mates from season seven of the show will run in New York: Bryan Arenales, Nic Vansteenberghe, and Elan Bibas.

Pick out your perfect race day kit: You can take all of the guesswork out of gearing up for race day with our what to wear ...

Whether you’re running outside or just hitting the treadmill, good music can often make the difference between a rave run and ...

Taking easy runs too fast is a common habit among runners, much to the chagrin of coaches everywhere. I know staying in the ...

If you want to avoid hitting the wall, take a look at your nutrition, training, and race plan.

From the regional, the top 10 male and female runners will meet in person for the final at the end of the year. They’ll ...

Whether you’re running, cheering, or celebrating a loved one, discover the best NYC Marathon gear to show your support and ...

As a child, Jenn Lichter and her siblings were homeless on the streets of Colombia. Running has helped her process her past.

How shoes are made and natural changes to your feet can cause you to reach for a different size. Experts explain why.

Amplify is a long-running experiment to build a type of exoskeleton that helps people run and walk with reduced effort.