So when NordicTrack offered to let me try one of their mack-daddy professional treadmill models, the Commercial 2450, I figured that might be the answer. Instead of nearly disposable devices ...

Take the NordicTrack Commercial 2450, for example, which is on sale now for $500 off. Or the good-looking, wood-trim walking pad our editors love, the Maksone Under Desk Treadmill, currently ...