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This 55cm stability ball offers additional resistance to your typical fitness ball routine with 3 lbs of weight ballast. Its durable anti-burst construction makes for a promising, long-lasting addition to your workout equipment collection. Also made with gym-grade PVC, this fitness ball is specially designed for all fitness enthusiasts. You won’t have to worry about any exposure to harsh phthalates thanks to its 7P-free, so you can continue to keep your health a priority. The included two-way action pump helps inflate the ball faster. Start targeting all the major muscle groups, including glutes, obliques, abs and quads, without bulky weights.