You had a great workout yesterday. You pushed harder, lifted heavier, ran faster, and left the gym feeling like you had finally “done enough.” But today, getting out of bed feels like a workout of its ...

New resistance-training science gives an old-school 100-rep squat workout a surprising second look.

They’re running themselves ragged — and possibly fast-tracking Father Time. Ultramarathons are surging in popularity, with more than 100,000 North Americans racing beyond 26.2 miles last year, nearly ...