Boxing treadmill

Prizefighters or wannabe fighters, or people with a lot of aggression to work out: I suspect it might be a useful thing to add a speedbag (or even some sophisticated kind of "slam-man" electronic tally/target) to a treadmill. That way you could jog and punch at the same time. This is perhaps not as much fun as the Doom or Quake mods to treadmills I see in this section but the aerobic benefits are outstanding. Maybe you could add a video screen for "Rocky-The Boxing Treadmill Game" or something. For that matter, instead of a speedbag, I suppose you could go with a rubber chicken on a cable that the runner has to catch...