Blast Fat, Build Strength: 60-Minute Calorie Meltdown

Burn 60 – Reese Witherspoon‘s a fan, and it shows. By combining high-intensity intervals on the treadmill with serious strength work, this 60-minute class targets every muscle group in the body while never letting the heart rate drop. Hard? Yes. Fun? Totally. Unfortunately, to get to an actual class, you need to be in LA.…