The same person who created spin bikes created the crank cycle. You simply adjust the tension to get a tougher workout.
You can learn more about anti-gravity yoga on the net at: http://www.crunch.com/crunch/about/detail.aspx?id=88
If you want to stay off your arms and legs, then climb into an anti-gravity hammock for a different kind of Yoga. The hammocks got their start in professional performances. The hammocks are much closer to the ground than in those performances, but getting over the fear of being in the air is still half the battle.
You can learn more on the net at: www.equinoxfitness.com.
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