A treadmill looks unwieldy but most fold up and roll on built-in wheels. The real risks are dropping the folded deck, cracking the console, and injuring your back on stairs. Here is how to move one safely.
Pro tip: Photograph the current console and incline settings so setup is quick at the new home.
Watch out: Never carry a folding treadmill without the deck lock engaged, since a dropped deck causes serious hand and foot injuries.