Stand up to gravity, the forceful bully responsible for holding you down all these years, with today's Groupon: for $13, you get four hours of open jumping and shoe rental at Sky Zone in Chesterfield (near St. Louis), up to a $52 value (tax included and shoes included). Showcase air-bound noises while bouncing higher than a gummy bear in moon shoes on the world's first 3-D walled playing fields. The patented design of the walls adds angled trampolines to the sides of the field, allowing jumpers to literally bounce off the walls. The four hours can be split between up to four total people.

Channel the exercise of kangaroos and beans with a session of open jump. Slip on sky shoes and prepare for 240 minutes of aerodynamic excitement ($13 per hour, including shoes) as you bound up and down, side to side, and through dimensional planes. The all-ages activity is an uplifting alternative to treadmills and stagnant fitness routines, and no athletic prowess is required. Check out a video of all the action here. All participants will need to fill out a quick liability waiver before living out leapfrog fantasies during dodgeball (subject to availability) or other over-the-top events.

Pioneered by an inventor more prolific than Thomas Edison, Rick Moranis, and Inspector Gadget combined, Sky Zone's special concept was awarded a patent for its originality, leading to the creation of the first court in 2002. The floor-to-wall jumpery allows attendees to live out video games and dreams about being a California condor, and makes a great road-trip option for an experience not available in Kansas City. Deftly maneuver while whirling through the air, get a three-dimensional workout, and finally get over the bitter regret of never going to space camp. And if Sky Zone inspires you to duct-tape trampolines onto every surface in your home or office cubicle, you might want to check out its franchise opportunities instead.

Capacity is limited at any given time. Waivers for jumpers under 18 years of age must also be signed by a parent or legal guardian.

Reviews

Skyzone has received great press, including a feature in Entrepreneur. It was awarded the 2008 GoCityKids Parents' Pick for Best Indoor Play-Space and Party-Space for Teens. It has over 3,700 Facebook fans, and three Yelpers give it a five-star average:

• In total that first year, 130,000 people showed up, enough to persuade the pair to try test locations in St. Louis and Sacramento, Calif. Sky Zone pulled the trigger on franchising in 2009 and is slated to open its first in Houston this month, then Boston in June, with Chicago, Columbus, Ohio, and L.A. on the way. – Jason Daley, Entrepreneur