Here's an idea for a better way to harness the power of stationary bike workout: use the resultant energy to fuel the electricity-sucking equipment for a banging outdoor concert. Pedal Power NYC recruited 250 volunteers to pedal 16 bikes, which, hooked up to generators, provided the electricity for June's NYC Celebrates Water Festival.

Pedal Power NYC's mission is "capturing and repurposing human power with bicycles" a.k.a “natural ass.” The group has a vague anti-natural gas platform, it seems: "We'd rather power our stage with natural ass than natural gas," its website declares. (Powering concerts with the third option, natural grass, went out in the '70s.)