Here are the best models from NordicTrack ... LifeSpan’s Fitness TR7000i is a commercial-grade treadmill—you’ll find this model in gyms and fitness centers, and it’s powered by a heavy ...

However, if you need something that takes up basically no space and has a running mode, testers say they would still recommend this treadmill. Best Commercial-Grade Treadmill: Life Fitness T3 ...