Though it prohibits us from bench-pressing cars, gravity is the best thing for getting water out of the sky and the only thing keeping football stadiums from floating away. Escape its omnipresence with today's Groupon: for $12, you get two hours of open jumping and shoe rental at Sky Zone in Chesterfield, up to a $25 value (tax 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.

Channel the exercise of kangaroos and beans with a two-hour open jump session. Slip on sky shoes and prepare for 120 minutes of aerodynamic excitement 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. Fill out a quick liability waiver before living out leapfrog fantasies during dodgeball (subject to availability) or other over-the-top events. Check out a virtual tour here. Pioneered by an inventor more prolific than Thomas Edison, Rick Moranis, and Inspector Gadget, 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. Deftly maneuver while whirling through the air, get a three-dimensional workout, and finally get over the bitter regret of never having gone to space camp.

Reviews

Sky Zone was a Parent's Pick on GoCity in 2008 for Best Indoor Playspace/Partyspace." Three Yelpers give it a full five stars:

• It's a great place to go with a bunch of guys who like to revert back to childhood every once in awhile. This place is really great for people of all ages. – Bill R.
• Very fun. Great workout. Recommended for kids and adults who want excellent, fun exercise. – Tuesday J.

The St. Louis Post-Dispatch says:

• Trampoline facility offers great aerobic exercise, and the fun factor is sky-high. – Amy Bertrand