I'm not a gamer, I'm a freeper.
But..
A few months ago, on vacation to relatives I had occasion to Bowl on a WII.
It was fun. I made the mistake of going through the motions as if I actually had a ball in my hand.
Sore for 3 days!
Whenever my parents are in town, they demand to play whatever new games I have for the Wii. Bowling is by far their favorite.
The Wii is finding favor with senior citizens as a way to get them in motion. Your experience is an example of why the Wii is succeeding in that market. The human body was made to move. The Wii combines the video game with that need to move.