I agree , I starting doing boxing stuff last year when I qs doing one of those 12 week transformation deals and was shedding bodyfat, I did up to 6 or 7 rounds of sparring 3- 4 times a wek in addition to running and my weigh workouts, I dropped anout 36 lbs in 12 weeks and lost nearly 6 inches off my waist. I use the heavy bag now and am quit enjoing that...I seem to have a lot of punching power....lol.