With a thick outer shell that absorbs multiple impacts, slamming or throwing this handheld ball against walls or the ground forces you to utilize more energy and force, resulting in more calorie burning and endurance. Using these weighted workout balls in place of dumbbells or kettlebells can improve your training significantly and burn more calories by adding extra weight to your sit ups, push-ups, squats, and plyo jumps. Whether you are a beginner on the fitness journey or a seasoned athlete, the weight varieties of these slam balls allow you to challenge yourself and provide an assortment of sizes for variety slowly and incrementally. Achieve your best shape, whether training alone or with a partner, by improving your overall body muscle mass, cardiovascular endurance, and hand-eye coordination, allowing you to perform better throughout your workout. Comprised of a strong outer shell and a sand-filled core, the dead weight provides challenging resistance, but will not damage or hurt walls, floors, or your personal trainer's hands.