Variety

I think it's the wide variety of options on the Wii that keeps me going each morning. Unlike a DVD where you're locked in to following a set routine, I can switch it up any way I feel in the morning. Not up to a 10 minute jog yet? Then I can choose a 4 minute set of set aerobics or a couple of strength exercises instead and come back to the jog later in my workout. That little bit of flexibility has kept me from burning out.