When most people think of cardio workouts, they think of some type of boring, steady state exercise like biking, rowing or running. And more often than not, they think they need some kind of expensive equipment like an exercise bike, rower or treadmill to get a good heart and lung workout. But, as you are about to see, all you need is your own body and a bodyweight interval training program.First of all, I don't like the term "cardio". I like to think of this type of training as...