I've had the Wii Fit for, oh, about a month now. And I'll tell you, I was sore after the first time using it. And with any break in time, or skipping activities and then going back to them, I'm sore all over again.
Here is a link to an article written by Health.com with their review of the device, Test-Driving the Wii Fit: Whee!. I thought it was very well
I've slacked lately. I need to get back on Wii Fit program!