CFF Deluxe Rubber 6 LB. Medicine Ball - Weighted Ball for CORE, Strength, Reactor (Speed,) CFF 6 lb Deluxe Rubber Medicine Ball - For beginners, rehabilitation, & kids Increases your speed, strength, coordination, conditioning while building a strong core, power, & explosiveness The perfect tool for Medicine ball push ups, lunges, rotational slams, wood choppers, and more The Medicine Ball is not only essential for core & upper body strength training, it is a total body workout Synthetic, weather resistant rubber surface provides an excellent gip