Hang Time
Hang Time is an iPhone app that times dead hangs from a pull-up bar and turns the habit into a game.
Prop your phone up facing the bar and it watches your body pose through the camera, starting the clock when you hang with straight arms and stopping it the moment you let go. Every hang is saved with weekly totals and streaks, and earns XP toward fruit-themed levels, pixel-art badges, and weekly quests, all wrapped in a 16-bit jungle arcade.