Builds strength and endurance by isolating muscles. Strengthens core. Substitutes kettlebell workouts. Great for performing rotational abdominal exercises and increasing the challenge of strength and conditioning routines. Made of hard-molded PVC with filler. Sizes: 6 lbs., 8 lbs., 10 lbs. 12 lbs., 14 lbs., 16 lbs., 18 lbs., and 20 lbs. Won't bounce.
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