Dumbbells are used to exercise all major muscle groups, including arms, chest, back, abs, legs and core. The benefits of dumbbell exercises include muscle building, improving core strength, boosting balance, providing better bone health, burning calories, increasing energy levels, enhancing overall mood and more. Dumbbells are perfect for training individual muscle groups or major muscle groups, HIIT workouts and walking. Built for durability, safety and comfort, the CAP Neoprene Coated Dumbbell Weights have an iron core made from ASTM A48