Mix it up a little, and try a Burn 60 workout that combines circuit training with running intervals. It's fast and fun, torching calories while building strength and stamina. That's a win-win. The classes are only offered in the LA-based studio, but luckily our own Anna Renderer is a trainer at Burn 60, and in this video, she breaks down the hour-long workout so you can do it at your own home or gym. Watch the video to learn the basic outline, and then give it a try.