there is this stair-master where each step is a mini-treadmill that moves up and down.  I think they should make an exo-skeleton that you wear, and you can put like a -10 setting on it, with gives 10 pounds of resistance to everything you do, or like a +10 setting which makes you ten pounds stronger!  Anyways, you saw it here first, even though i’m sure EVERYONE has had that thought before.