We've all had those moments as a child where our parents tell us not to do something and we do it anyways. My mom never wanted me or my brother on a trampoline until my dad came home with one and she didn't have a choice but to let us jump! Come on---What's not irresistible about built up potential energy in springs shooting you upward and then you making a (semi) safe landing space as the springs fill back up with potential energy. The low spring constant in the trampoline springs sends you flying because the lower the spring constant, the smaller amount of force is required to "stretch" the springs. However, the heavier you are, the higher you'll fly! So next time your parents are apprehensive about letting you jump on a trampoline-- explain to them the physics of the trampoline! Or maybe just confuse the, with really big physics words until they agree to let you jump!