Regular strength training builds strong bones, muscles and connective tissue. The muscular strength and endurance you gain from lifting weights can also make everyday movements, such as carrying groceries or moving boxes at work, feel easier. Dumbbells are among the most versatile strength-training tools, both at home and in the gym. Pair of Neoprene coated Dumbbells for aerobic and fitness training. 2 x 2Kg Boxed in a pairsCore made of cast iron , Coated with a layer of non-slip vinyl.