Whatever, but I find they do not work at all.

It doesn't use the standard BMI, it called me "Obese" 2-3 BMIs lower.

As for the subtle movements, I felt it's the exact opposite, I have to do ridicolous motions for it to slightly detect me. 

 I'm 28 BMI and I told it I want to be 27 BMI and it still said I would be obese.

When I was looking at it this morning, it looked like the line was at 30 that it went from overweight to obese.

Are you sure you were reading it right? Maybe you saw a line above your current weight and if you cross that, it would be obese, but you were most likely in the overweight area. Try zooming out, or did it actually speak the word obese?

he could also be young, which I think affects how you calculate weight category based on BMI.

I tried it about 20 minutes at my sister's home today. It's far more motivating and addictiing than I ever thought.

The lessons look very interesting and the balance games I've seen so far are fun and work well for me. 55 seconds in skiing in my 2nd try :D

And people, please don't always discuss this BMI thing when it comes to WiiFit. Who cares.

Hm, maybe I should buy it after all... It's never sold out in my area.

I find it very strange that your having problems with the games, football headering works perfectly once you get the idea that you DON'T have to move that much, just shift your balance, same goes with Skiing and the rest. The marble game just makes it far more clear which is why it "works" for you.

I think you might be leaning to much one way and then other forcing your body to over compensate making it far harder then it actually is.

The games are good fun once you get the knack

Nintendotogepi you must have a bug inyour version because mne says 29.5 and it says I am Overweigth not Obese. Even on the graph they use it shows Obese at 30 which isrigth above the line I am on.

could be age. here is the chart for BMI by age from the CDC

wow lot's of high BMI's.. I have a 19.3 BMI

As far as working, mine works like a charm, you don't have to make big sweeping movements it's all balances and weight distribution. I also have a perfect 50/50 balance which I thought was awesome ^^.

It senses weight shifts pretty well, maybe your problem is your control over your balance? Give it a go try to shift your weight around while standing in place, it's difficult if you don't know how to do it but once you've got it that's it.

One other thing I noticed that is kind of cool. I created an accounted for a women who comes over and while she was trying to do someting in Yoga I thought I woudl show her how to do it. However when I stepped on the board it immediately put a message up saying that her weight has changed and asked if you wold like to continue.