Testing myself this morning to see how long I would go before stopping. I managed 4 minutes. Not too shabby considering I haven't had much practice yet. My left knee and shin are ouch! I iced and now feel much better. Cardio didn't stop there I continued to walk / jog for another 40 minutes. Not bad but I would like to go for an hour. My goal is to do an hour of cardio 5 days a week. Maybe then I'll drop some pounds.