Some dude lost 10lbs playing the sports games, especially boxing. But you have to enact the full motions and not try to get away with minimum motions.
I am still trying to find one of the damn things for a decent price!
Monitoring wiialerts.com
I found one last week at a local Walmart. I did not find the Wii alert website useful. I called a few Walmarts every morning until I got lucky. One Walmart just received a shipment of 8 Wiis. My wife purchased one within an hour just before they sold out.
My daughter was complaining about her shoulder after using the Wii tennis game. She had trouble serving last night after playing the Wii all weekend. She developed a power serving technique in the Wii tennis game that allows her to ace the opponent. I have not been able to replicate her power serving Wii motion.