or alternate between upper and lower body 5 days a week? right now i do squats, bench press and dumbell curl 3 times a week 30-45 min sessions and have 2 days rest between each workout. is this enough? i am not doing any form of cardio except punching a heavy bag flat out for 5 mins to warm up before the stretches and workout. i know i should be on the treadmill, bike or cross trainer but i workout at home and until i buy one this wont happen.