Amazon's Most-Loved Workout Equipment, From Weights to Folding Treadmills

321 Strong Foam Roller ($36, originally $39)

With more than 30,000 five-star ratings, it's no secret that this foam roller is one of the most popular on Amazon. It has 3D massage zones that knead away tension while you roll, with a large fan base of shoppers who swear by its quality and attest it helps reduce muscle pain. "I had numerous other rollers that wore out, or broke. This one is still going 3 years later," one of many satisfied shoppers writes.