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Flat Semicircular Vs Straight/Bumpy Rails (Track)

Flat Semicircular Vs Straight/Bumpy Rails (Track)

Why do we see curved rails on a piece of exercise equipment for which we've been looking to soothe or reverse back pain? 

Because these curved rails typically reduce stretching on your back.  ( Whence:  A point-to-point distance between the curved and straight rails is very much noticeable. )