Once you have a trampoline, you may want to hack it to get even more altitude from your bounces. While safety should be your first concern, if you really do want to increase your jump height, there are a number of things you can try. First, older trampolines will gradually lose their bounce as springs become worn down, rusty, stretched out, or even broken. Try replacing your springs to restore your trampoline to its former glory. If you still want more bounce to the ounce, you can try altering the spring pattern, criss-crossing them in X or V patterns. Be aware that this may cause the springs to wear down faster, though. You can also try adding more springs or changing the springs out for heavy-duty ones.