Time Out says
You don’t need cardio to get your heart beat up when you’re suspended from the ceiling in a hammock. Think of it as yoga with the aerial daring of circus arts, the grace of Pilates and the gymnastic showmanship of pole dancing. Easier than it looks (as long as you have the stomach for it), this innovative form of the ancient art is perfect for those with wrist, shoulder or back problems that keep them from doing traditional mat yoga; the hammock makes poses like bridge a simple matter of letting go. In the LA area, find classes at Crunch Gym on Sunset, where first-timers can get a free one-day pass, and at Believe Fitness Studio in El Segundo.