Yes, just as they have said, its not necessary to "jump around" for wii games. In fact, my cousin can bowl 260+ score games in wii bowling while sitting. I on the other hand refuse to sit for any wii sports games, but for nearly every other, i do sit. Also my TV is at waist height in my living room, so while standing I have to kind of look down.
its mostly just hand movements side to side, and aiming the ir cursor at the screen.