The real question, of course, is this: is Wii Fit a viable workout tool? Definitely, yes. No, Wii Fit is not going to transform your life and make you healthy and fit, but it's a good way to get interested in exercising, or keeping up with your routines if you have limited time, space, or funds. There is some great variety among the exercises (once you get them all unlocked, which takes several hours), and it's a nice alternative to boring old regular exercise. If I'm on the treadmill, it's unlikely that my father-in-law will run past. It's even more unlikely (regrettably) that the White Stripes will run past, but that can happen while jogging in Wii Fit!
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