I've been considering the Nike+ Fuelband as the second ver. seems to be getting good reviews. I've been a competitor lifter for years, and now getting into a cardio routine for the summer. I'm surprised there isn't a version for the ankle as this would be a better determinant of activity as opposed to the arms. Any idea if it can be used on an ankle or if there is something in the rumor mill Nike may be developing such a model? Thanks!