Wow, thank you for that wealth of knowledge! I will spend time researching the things you mentioned. Thanks so so much for your input - it means a lot.
A side question - do you know much about rebounding? I am on a budget but looking to purchase one of two trampolines... Either a cheap mini trampoline or a full sized second hand one. Both are about the same price. I think the full size one would be more fun (haven't bounced on one since I was a kid) but just want to be sure it's as beneficial to the lymphatic system doing big bounces on a big tramp!