I believe the health problems that have been reported with the Wii Fit are that people aren't warming up and cooling down or stretching when they work out - it's just a game, right?
That said, as someone who's been doing yoga off and on for years, I will NOT do the yoga poses on the Wii Fit. I think a lot of those poses put you into unstable configurations and can lead to more injury than "regular" yoga. If you Google "yoga poses on wii fit" you will come across a few articles that give more information on this.
If you're interested in yoga, you might look at some of the Rodney Yee beginner yoga tapes. I also really like Yoga Journal's Step by Step series, particularly Session 1, but they're available much cheaper if you buy the three-pack: www.yogajournal.com/shop/home_practice_dvd
- the nice thing about this particular set for a beginner is that you can run through the poses in the regular "flow", of course, but also there is an option for the instructor to walk through step by step with a model and show both modifications for your ability/flexibility/skill and common errors to watch out for, and, more importantly, there is an option to walk through the poses with medical commentary and it really goes over conditions that the pose can help and conditions that would give a reason to avoid a pose, as well as common injuries that are signs of doing the pose wrong.
Of course, the best answer with yoga is that if you ever feel any pain STOP RIGHT THERE. Look for a modification of your pose or just rest. Listen to your body, it will tell you what is too much.
And... now you know way more about yoga than you wanted to.
Vision without action is a daydream; action without vision is a nightmare -- Japanese Proverb
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