Though it prohibits us from bench-pressing cars, gravity can't be abolished because it's the best thing for getting water out of the sky and the only thing keeping football stadiums from floating away. Temporarily escape it with today's Groupon: for $40, you get iFly SF Bay's Earn Your Wings Package, which includes a training session, flight gear, assistance from a personal instructor, and two flights in iFly SF Bay's gravity-defying vertical wind tunnel in Union City plus a DVD of your session (up to an $79.90 total value). iFly's technology mimics the feeling of skydiving without the “human body plummeting toward the earth at 9.8 meters per second factor”; it simulates a dive by suspending you only a few feet off the ground. The tunnel is a safe way to enjoy the thrillcitement and spectaculation of skydiving for people who love the idea of skydiving but don't like the idea of wearing a cumbersome parachute, falling out of a plane from 18,000 feet in the air, or skydiving. Two flights in the tunnel gives you plenty of time to practice your MJ-tribute moonwalk, rid the dust from your gaming cartridge, or pop the question to a significant other or a person who you'd like to make your significant other. The DVD lets you relive your tricks and maneuvers for years to come or until the DVD gets replaced by digital-VHS in 2019. iFly is open to people of any age, so round up your Girl Scout troop, bridge club, or oil refinery and take them flying.