This is the GD Muscle Pump: a versatile chest expander that helps you work on your upper body without a whole lot of room. You can adjust the resistance from 22 to 100lbs in just 3 seconds. You can use this to work your chest, biceps, triceps, and shoulders.
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The GD Muscle Pump uses a gas spring to get the job done. It is compact enough to easily fit under your sofa or bed. This chest expander has stainless steel nuts & bolts and a silicone grip.
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