Cardio

This kettlebell killer will torch calories and fat in 12 minutes.

Cardio isn’t fun…unless you’re getting it done without really trying. Here are five ways to do just that.

Why they suck, why you should do them anyway, and how exactly to prep yourself for the task.

Looking to ditch a few pounds? Use these powerful cardio programs to strip body fat in eight weeks with specific plans for 5- or 10-pound losses.

Looking to boost your speed and conditioning? Find a hill and get to work.

Improve your size and conditioning with these two outdoor workouts.

Get chiseled and conditioned with one simple (but brutal), equipment-free exercise.

Here's how to make time your most valuable asset in the gym.

Kick up your fat-burning with this down-and-dirty HIIT workout.

The dual aerobic and anaerobic demands of this Tababta protocol will push you to the limit.

Go with the flow of research on high-intensity intervals to sprint your way lean.