i've wondered about that myself, but considering they're showing yoga poses in that tv ad, i'm pretty sure you're gonna start with the easiest poses and work your way up the level of difficulty. the fact the woman has a great sense of balance (i suspect they had to shoot the ad many times until she got it right

) doesn't mean it's easy for everyone else.
i'm more worried about the number of exercises per level of difficulty there is, if you're gonna spend time on your wii board, or if after a while it will just collect dust.