People who suffer from back or neck pain will do a lot of things to find relief—including, it seems, lie on a bed of nails. Covered in tiny, sharp plastic pressure points, acupressure mats are an increasingly popular tool for soothing muscle pain and promoting relaxation, like a good massage or acupressure session would.  Its 4,000-plus plastic spikes put pressure on many different parts of the body at once, helping release tension and promote blood flow.