You haven't felt the burn in until you've mastered cossack squats. Here's exactly how to do perform the move correctly, according to a trainer. Squats never fail to provide the best and worst burn.

You don't need lunges to build stronger legs with knee pain; just try this personal trainer's alternative, called the ...

Bend one knee and push your butt back to squat down to one side. Keep your other leg straight, and as your lower down ...

The “zone zero” fitness trend promotes very low-intensity movement, like walking and housework. Here’s what it can — and can’t — do for you. By Danielle Friedman When you’re exhausted, burned out or ...