I trained with Coffey, cofounder of DeFine New York Run Club, for my first marathon before following him as he co-launched ...

Runners of all types rely on run/walk intervals both to train and race. These intervals can help increase speed and mileage for faster overall race times. However, there is a sticking point! This ...

Most solid training plans include a weekly speed workout, often in the form of intervals. But the length of those intervals usually depends on your race distance, training goals, and fitness level.

Find out why U.S. track star Sydney McLaughlin-Levrone wanted to push herself to new heights and more in a recent Q&A.