Man, I love the Wii Fit. Just got off after like, an hour of playing. I had to steal the control away from my hyperactive little brother, but... eh. All in a day's work. Oh, and no, this isn't spam. I'm not getting paid or anything to write this. I just love the Wii Fit :)
By far, my favorite game is the hula hoop one. I feel so stupid doing it, but it really wears you out!