Do curved treadmills like the SB Fitness CT400 actually work?

How a self-generated curved treadmill actually works

Here's what's actually different under your feet. There's no motor spinning this belt. The deck curves upward at both ends and sits on a set of flexible slats, and the only thing that moves it is you, pushing back against the ground with your foot. That single design choice changes everything about the session. Because nothing is dragging you forward, the belt only goes as fast as you drive it, which means sprint into a walk and it slows the instant you do, no button, no ramp up lag. That's the whole appeal for interval work: you can go from an all out push to a recovery jog in one stride, which a motorized deck simply can't match. The curve itself does double duty. It nudges your stride toward a forefoot strike instead of a heel plant, which pulls your hamstrings and glutes into the work instead of leaving it all to your quads, and that's the mechanical reason a curved session taxes you harder than the number on a flat one suggests. The three resistance levels stack extra load on top of that, so you can make an easy jog feel like a hill without touching an incline setting. The flexible track slats exist because a non-motorized deck has no motor housing to absorb shock, so the give has to come from the slats themselves, which is what keeps your knees from taking the full hit rep after rep. The display just keeps score, time, distance, speed, calories, so you see the effort you actually generated instead of the effort a motor generated for you.