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Squat Sponge allows for proper form of squats and lunges w/comfort for the upper and lower back and abdomen area sock absorbing low-density foam for cradling the spine. Molded thick foam of varying degrees of open and close cell foam; thickness and density with a grooved channel in the center it is18” long, 3.5”diameter &1.25” thick that will cradling the spine.
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