While most of the civilized community began to use palm pilots, black berry's etc.... The bodybuilding community is clearly behind the technological trends. (big shock there).
The fanny packs are clearly for:
1) Hand written agenda (scheduling meals, workouts etc...)
2) Portable CD player with headphones
3) Cellular phone and wireless headset (for cardio)
4) Drug stash for sharing selling
5) Some money and wallet with a trillion cards inside