Enter Matt Fox’s infamous 300-rep Leg Destroying Challenge, a workout designed not only to test your strength but also to push your endurance, grip, and mental grit to their absolute limits.

Produced in cooperation with the Boston Athletic Association®, which granted NOVA unprecedented access to the 111th Boston Marathon®, and Tufts University, "Marathon Challenge" takes viewers on ...

A man who ran the entire length of Africa has begun his latest challenge – running the full length of New Zealand. Russ Cook, nicknamed Hardest Geezer, completed his previous endurance challenge ...

Produced in cooperation with the Boston Athletic Association®, which granted NOVA unprecedented access to the 111th Boston Marathon®, and Tufts University, "Marathon Challenge" takes viewers on ...

The stations are low-skill in the sense that they require little training and expertise to master, making the challenge accessible to people from all walks of life. The zones remain the same in ...