How dare Nintendo make me exercise when I thought I was going to get to sit on my butt all day and play videogames?!? For shame! What happens when a motion controlled videogame system requires you to move? Well, you get people complaining of sore muscles and have no clue why. Hello, it's called exercise people.

From the article:

In Rochester, Minn., Jeremy Scherer and his wife spent three hours playing tennis and bowling, two of the games included with the Wii. Mr. Scherer says he managed to improve his scores -- at the cost of shoulders and back that were still aching the next day. "I was using muscles I hadn't used in a while," says Mr. Scherer, a computer programmer who describes himself as "not very active." Mr. Scherer is vowing nightly "Wii workouts" to get in better shape.

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See Nintendo's videos of people using the new Wii controller.Another hazard: collisions. All those flailing arms can sometimes inadvertently smack into lamps, furniture and even competing players. IGN.com, a popular site that reviews videogames, said one player testing the Wii lost her grip and sent the controller flying into a wall. Blaine Stuart of Rochester, N.Y., mistakenly whacked his fiancée, Shelly Haefele, while playing tennis and also accidentally hit his dog while bowling.

Nintendo itself warns players about this risk just before some of the games begin. A message flashes up on the screen saying: "Make sure there are no people or objects around you that you might bump into while playing." Some Wii games also have pop-up reminders every 15 minutes advising gamers to take a break.

Perrin Kaplan, a spokeswoman from Nintendo, says the company hasn't received complaints from any gamers about soreness. "It was not meant to be a Jenny Craig supplement," she says. "If people are finding themselves sore, they may need to exercise more." She says that while it might be more fun to play the games more aerobically, it's possible to play without leaving the couch.

Read the full article over at online.wsj.com