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Think you're a workout machine? Take on this high-rep challenge and record your score!
Junyong Pak, winner of World's Toughest Mudder, shares his secrets
Think you're a workout machine? Give this 3-part, 2-minute pull up variation test a try - record and share your scores.
Running the treadmill this winter? Here's everything you wanted to know about training on one.
Sick of running solo? Here are the best races to sign up for in a team.
1,000 racers. 24 hours. One goal—worldwide bragging rights.
Here's how hundreds of would-be NYC marathoners put their months of training to use.
Thought Tough Mudders were hard? Think again.