Last night, I had a 42-credit session. My weight had gone up a negligible amount. Go figure. (See? This is why having a scale around is annoying!)
I started with a long Basic Run, then hit the Basic Step. As I had hoped, that unlocked Advanced Step, which I did twice. Much harder, coordination-wise! Then I did the ski slalom a dozen or so times, trying to knock off Bryan's high score. I didn't, but I scored a 2nd place finally. In that process, I unlocked the Rhythm Boxing and did it twice. Fun!
I don't know that I'm going to make any major weight-loss goals doing Wii Fit, but it's fun, and we're filing it under "Much Better Than Doing Nothing"!