Recently I went to Altitude, a trampoline park. Trampolines make you jump really high. Trampolines are made of a woven material that is connected to springs on all sides. These springs are what give trampolines their ability to throw people in the air. Lets say that the trampolines at altitude can make me jump 2 meters high. That would mean I have a gravitational potential energy of 1245 joules at a height of 2 meters. All of that energy would be converted to elastic potential energy when I jump on the trampoline. 1245 joules of elastic potential energy means that the trampolines have a spring constant of 622.5 N/m.