Obstacle Course exercise and fitness equipment for KidsRecommended for groups of up to 10 people. Combine the 9 inch and 18 inch Platforms to position your rails on inclines and declines. It's a unique and exclusive feature that dynamically changes the neuromuscular demand for nearly every exercise. Set your Course up in 2 parallel rails of 19 feet each for alligators, reverse crabs, or more complex speed and agility drills that combine multiple exercises. Position rails at 9, 18, 27, or 36 inches high to