WalkingPad X21 Double-Fold Treadmill

The WalkingPad X21 is built around double-fold storage: instead of folding flat to slide under a bed or couch, it folds twice so it can stand upright against a wall or in a closet — the design that's won it both a Red Dot Award and an iF Design Award. A speed dial controls pace directly rather than through button presses, and the KS Fit app logs every session toward your weight-loss or step goals.

It pairs with Android phones over NFC for a quick connection, and a detachable phone holder keeps your screen in view for shows or calls while you walk.

Compared to other pads in our WalkingPad lineup, the WalkingPad R3 Hybrid+ ($799) folds flat for under-furniture storage at the same price — choose the X21 if wall or closet storage suits your space better than under-bed clearance. The WalkingPad C2 ($449) is a simpler flat-folding pad for less if the double-fold, award-winning design isn't a priority for you.

Good fit if wall or closet storage works better for you than sliding a pad under furniture. Skip it if under-furniture storage is more convenient in your space — the R3 Hybrid+ and C2 both fold flat instead.