im not a big cardio person, and even when i do run, i keep it intense and short (20 minutes) only 2-3 a week, if that. a thing my friend and i like to do once a week, is as follows. (you'll be feelin' the burn and sweat, i guarentee)

10 total sets of:
10 squat thrusts directly followed by 30 seconds jump rope followed by 10 seconds of double jump roping (2 swings for every jump).

*squat thrusts is done by squatting down then laying yourself out into the bottom of a pushup position, pushing your up and then standing back up. you rest half a minute, then onto the next set. Ten of those suckers and you'll be drowning in your sweat. Give it a shot. Sage