I just purchased a portable trampoline for my 22 yo daughter who has a weight issue. She's used it for two days, so it's too early to tell how it will impact her physically and mentally, but my guess is that it will help enormously.
A trampoline sounds like a great idea. Not only is it good exercise, it's fun, too. My daughter would love to have one. We just don't have the space for it.
I'm curious. How does a 22 month old have a weight issue? I understand the problems with older children who have access to all kinds of "food", but I remember my little ones eating what was provided.