I want to buy a treadmill cuz its too hot to walk outside, but I dont want to buy a brand new one. I dont mind buying used if it still works. but where?

Whenever i used my treadmill, it trips the electric and shuts down. It only runs for a few seconds then clicks off. I'm using a surgeprotector and my wiring is fairly new. It used to wrok fine, but not now. What can I do about it? I really don't want to pay an electrician to come in. Thanks

I've read that walking on a treadmill is better than walking on the ground outside because the treadmill provides dynamic cushioning (or something like that). I'm wondering if anyone with knee pains has used a treadmill and how it worked out for you? I'm not sure on a specific diagnosis at this time, possibly a dislocated kneecap, arthritis, or something else, so I'm just looking for general information on how treadmills and knee problems go together. Thanks.

I am trying to sell my treadmill and need to findout market value for it. Is there a blue book for treadmills?