Best Back Stretchers

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Arch height is the only adjustment these devices have and it is effectively the whole product. The multi-level boards here generally offer three settings, and the gap between the lowest and the highest is not a matter of preference but of tolerance, because a board puts your spine into extension under your own body weight and there is no way to ease off once you are lying on it. Starting flat and working up a level over weeks is the sensible route, which is also why a fixed board with no adjustment is worth skipping. The second thing to examine is the width and padding of the contact ridges, since the load lands on two narrow strips either side of the spine and a hard thin ridge concentrates it into a point that hurts without telling you anything useful. Dual-sided designs give two different curve profiles from one board and effectively double the adjustment range. Confirm the stated weight capacity, because these are moulded plastic working in bending and a cracked board fails all at once. The posture-correction framing and the magnet or acupressure nubs can be ignored. If you have disc symptoms, or pain and numbness travelling down a leg, this is a device to raise with a clinician before buying rather than after.