Bro, I came up w/ a good alternative to traditional cardio. Take 7-8 exercises that will hit at least each body once. Set the weight where you can do reps of 20-25 fairly easy but not too easy. Perform each exercise back to back w/o rest(one to the next). Once you've done all 7 or 8 exercises rest for 60-90sec. and repeat 4 more times. It shouldn't take but about 25 minutes to complete. It's pretty tough but doesn't take that long.