I run, but I am a better swimmer.
Might the Nike + App work if I had an underwater proof case and possibly inserted the little bluetooth sensor in a flipper or fin? Or maybe attached somewhere along my jammers when it records the kicking from my thighs or from breaststrokes on my arm? lol Sounds kind of retarded, but I wonder how effective it might work underwater, knowing that one person can burn a calorie every yard they swim. Each lap across a regulation sized pool is 25 yards, so 25 calories per lap across. Now THAT would be something awesome to record...