Wow. This sure gets the old heart beating. I love the sparring. Ducking and diving and hitting the targets, which is amazing accurate. We only have a small lounge, I'd say about 4 feet from the tv screen, but there were no problems al all for 70% of the exercises but trust me you will still get your monies worth with this game.
For an extra muscle burner once you have progressed so far, treat yourself to a pair of wrist weights and see how much you start to firm up after that!