Weights. Treadmills. Spin classes. Let’s face it, workout innovations just haven’t kept pace with advances in TV, iPad, and snack-food technology. (Did you know there are onion-ring-and-ketchup-flavored Doritos now?) That said, a few forward-looking gyms offer activities that might actually compete with our Twitter/Netflix/PizzaRanch fixations. Activities like bouncing up to 10 feet in the air while playing dodgeball. Crunch Fitnesses of the world, take note.

House of Air,San Francisco
The professional-size trampolines in this former airplane hangar are set so you...