Dumbbell in stock Round head dumbbell Item Round head dumbbell Specific 2.5/5/7.5/10/12.5/15/17.5/20/22.5/25 /27.5/30/40/50 kg 5/10/15/20/25/30/35/40/55 LB Material Cast iron with rubber Color Black Application Exercise area: back muscle 1. On the prone bench, the limbs droop, hold a dumbbell with one hand, and hold the leg of the stool with the other hand, let the upper arm holding the bell close to your side, bend the elbow, and let the forearm droop naturally. 2. Keep the upper body and upper arm still, contract the triceps, stretch the forearm upward and backward, until the arm is completely straightened, and at the same time completely contract the triceps. Stay still for one second, then bend your elbows, and let your forearms droop to the starting position. 3. Breathing method Inhale when you stretch your forearms, and exhale when you droop. Exercise parts: anterior deltoid muscle, side deltoid muscle 1. Hold a dumbbell in each hand and curl, stand or sit up, but ask to straighten your back, raise the dumbbell to the shoulder position, palm facing yourself. 2. Then lift up like a dumbbell press and start to rotate your wrists so that when the dumbbells are raised to the highest point, the palms face forward. 3. Pause at the highest point, then use the opposite trajectory to lower the dumbbells and repeat.Dumbbell in stock website:http://www.zbshell.com/dumbbell/