Sales of the fitness videos, which have been around for more than a decade, really took off in August when Republican running mate Paul Ryan announced that P90X was his favorite exercise routine.

Back then it was all about warm-ups and cool-downs, and telling them to eat better and get off the hooch.” His evolution ...

When lifting weights, a good rule is resting for 48 hours of recovery time per muscle group, fitness experts say.

Wearing a grey collared short-sleeved shirt and black pants, the 59-year-old creator of the uber-popular P90X fitness program walks out to the applause of 5,000 attendees, where he’ll spend the next ...

you might have seen an informercial for P90X. The exercise program promised shredded abs and bulging biceps for anyone who pushed themselves to their limits for 90 days of 90-minute workouts.