... price 2.exercise your abdomen 3.strengthen your back muscle 4.strengthen your arm musc Features: 1) ... abdominal contraction of muscles in arms, shoulders and Back 3) Materials: PP, PVC Inner packing: 1PC ... work on ABS, waistline, obliques, arms, chest, back, and shoulders. Ab slider is the latest in ... the AB muscles in your arms, shoulders and back. ASSEMBLY INSTRUCTIONS: The Roller Slide frame comes ...