This type of two-a-day workout can help unlock speed for some top-tier runners. Experts say it's not for everyone.

Long before global headlines called her “the world’s most beautiful runner,” Alica Schmidt was carving out a track life marked by persistence that never wavered. Over time, her craft sharpened, and ...

Hyrox is a brutally effective test of fitness because it forces you to build strength, speed and endurance at the same time – ...

News editor Theo Kahler is by far the fastest in the Runner’s World office … seriously. Kahler just finished within the top ...