"What do you do for cardio? Lift weights faster." ;-) http://www.jensinkler.com/lift-weights-faster/ http://www.jensinkler.com/lift-weights-faster/ If you're n

"What do you do for cardio? Lift weights faster." ;-) http://www.jensinkler.com/lift-weights-faster/ http://www.jensinkler.com/lift-weights-faster/ If you're not particularly fit then rigorous strength training including ballistic and plyometric activities will get you out of breath, increase heart-rate, and give you a serious workout while being a lot more fun than running on the spot. (But as always, different strokes for different folks..)