Air Conditioning 

You like to have your butt thoroughly kicked, do you not? You may have already kicked your own butt with dance class, yoga class, brutal hikes, standard gym visits, athletic sex, or what have you, but have you done it on a trampoline? At Air Conditioning classes, use the power of bouncing to intensify the kicking of your butt: Your teacher shows you how to make everything extradifficult — and funny! Think about it: Even simple push-ups become excitingly and core-strengtheningly unstable when performed on suspended elastic. The facilities include nice showers, because you’re gonna need ’em. — By Hiya Swanhuyser

Price: $16