trampolines!?!

HI flo I not sure how many calories you'd burn on a trampoline. I imagine it would be the same as a low impact aerobic workout. The calories burned information is only general anyway. A super fit runner would burn far less calories running 1 mile then a weekend warrior because the body become more efficient (burn less calories) as you perform an activity over and over.
One thing I know for sure if you enjoy the activity you'll do it more. I like running and weights, but at about 1/2 through a workout I thinking about how many sets or miles I have left. When I do something that I love like karate or handball I wishing it never ends. thats why I can play hand ball for hours on end. do do what you enjoy.

This is something that should be done while wearing at HRM. That way you know for sure.