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Maybe people can be more pumped for their next workout if they simply try bouncing into action. That is the idea behind "Bosu Bounce" at the 92nd Street Y on the Upper East Side.

"Bosu Bounce pretty much is a great concept for anyone and everyone because it incorporates all components of fitness," says instructor Samuel Lopez. "It incorporates agility, balance, coordination, working on physical strength, cardiovascular endurance, muscular endurance, power, so every component of fitness is pretty much taxed."

Participants might say another one of those components might also include sweat.

"I've noticed in the past six or seven months that I've been taking the class that I've gotten into much better shape. I'm stronger, I can run longer. It's just really overall amazing body conditioning," says participant Amanda Harman. "Instead of being on the block or something, it is on the ball, which really strengthens you up because you have to have flexibility as well as balance. So it kind of shakes up your body to something you are not used to. So you strengthen muscles you wouldn't normally [strengthen] if you were on a treadmill or in a spin class."

Hopping onto the blue half-ball, also referred to as a "balance trainer," participants can run on it and do push-ups, squats, leg lifts, some boxing action and lunges.

"You are on an unsteady surface, so if your balance isn't that good it is probably going to be more challenging. But the more you do it the easier it gets," says participant Amy George.

With time, it gets easier to bounce back.