I'd most compare it to yoga I suppose. You're in a weird position, its really hard on your wrists as you're putting a good bit of weight and pressure on them. L

I'd most compare it to yoga I suppose. You're in a weird position, its really hard on your wrists as you're putting a good bit of weight and pressure on them. Lots of precise muscle control, as small movements of your head even can direct your motion. You're being hit constantly with wind, and your muscles tense up a lot. Also, its very hot (or sometimes very cold) frequently. Not 'exercise' as much as abuse and strain.