IBF Iron Body Fitness deluxe medicine balls are among the most dynamic training tools on the market. They incorporate core strength, cardio, flexibility, and stamina into your workout. These weighted balls are designed to bounce and feature a heavy-duty dimpled rubber surface, which provides superior grip and durability. Use them for a variety of individual & partnered exercises, such as weighted crunches, lunges, sit-up passes, and more to improve your overall strength and conditioning. They are also weather-resistant, so you can take your workout outdoors, rain or shine. This set includes a 6 lb. ball and a 12 lb. ball, so you can incrementally increase the challenge of your exercises.