This is the opinion of Perrin Kaplan vice president of Marketing & Corporate Affairs for Nintendo of America.
The Wall Street Journal reports that the physical nature of the Wii control system is giving people a work out they didn't expect.
A 12-year-old American girl said that playing on the Wii is "harder than playing basketball," and customs broker Ryan Mercer, who happens to lift weights says: "I was soaking wet with sweat, head to toe - I had to go take a shower." He also noted that the following day he had trouble putting his shirt on.
Nintendo's Perrin Kaplan appears to have no sympathy for aching gamers though, stating that "if people are finding themselves sore, they may need to exercise more."