Using modified circus equipment, trapeze classes pit you against gravity. Much of this intense cardiovascular workout focuses on your upper body and core muscles, while giving you a much-needed break from the monotony of a treadmill. Working with a trapeze bar hung from the ceiling, the arm work involves suspended jumps and pull-ups, various planks done with your feet strapped to the bar, and a series of spins that require the use of arm and core muscles. Gyms like Equinox in NYC have jumped on the circus bandwagon by offering trapeze classes that get you a few inches off the ground, but dedicated schools like the Trapeze School New York will give you the real circus deal—23 feet in the air. So take your pick. Either way, you’ll feel the burn the next day.