I have been told that jumping rope... which I do 1 to 2x's daily for 20 minutes.... can burn 11 - 20 calories per minute depending on your intensity level.
My coworker & I were talking about this two days ago. She informed me when she jumps rope she uses a mini trampoline to save her ankles. I thought that was a great idea. Think I will be in the market for a small trampoline soon lol Sounds like fun too!!!