For me, this is playing video games.
Let me explain.
A few weeks ago, my husb and I decided to add an XBox to our family. It was the first large purchase that we've made, since...well...ever, I think. We added the Kinect sensor, which tracks all the player's movements. A week or so later, Dance Central came in the mail. Awesomeness ensued.
Dance Central is kinda like Dance Dance Revolution, only with arms. And heads, shoulders, knees, and toes. It tells me what dance moves I need to make, and I make them (or try to). It also keeps track of my heart rate and calories burned. And it makes me feel cool because I know the latest songs and can dance to them. Whether or not that actually makes me cool, is debatable. Probably not, but let me just think that it does and leave me and my fantasy baseball team in peace.