hay bros, i am 34, 5-9, 195, approx. 15% body fat, decent diet, and have worked out on and off my whole life. however, last novmember i had knee surgery, so i layed off the cardio and have hit the weights hard for almost a straight year now and eating tons of protein and proetein shakes, but i've noticed i need to decrease my belly fat. so, i need help with how much cardio i should be doing to decrease belly fat without losing a lot of the muscle size i just put on. and , if shorter more intense is better or slow longer?any help would be great. also, any suggestions on a good fat burner to go along with the cardio?thanx.