The Scientific 7-Minute Workout is fast, efficient and works for almost everyone. Chris Jordan, the exercise physiologist who helped create it, explains.

There are lots of reasons you can fall "out of shape." From injuries to waning motivation, it’s natural for your fitness to ...

Participation in once-popular HIIT workouts is flagging. But experts say it’s still one of the best types of exercise you can ...

She's a fan favorite on DWTS, but Karina will be the first to tell you that sometimes even she has "fat days." "There's always a body part you want slimmer, taller, skinnier," she said. "There's ...