Hello, the method of dumbbell chest expansion is as follows: separate your legs, hold the dumbbell with both hands, keep your upper body forward, and straighten your back and neck. Lift the dumbbell up and down to your chest, inhale when lifting it, and exhale when lowering it. It can only be said that it has a certain effect and can achieve the purpose of strengthening the chest, but it must be adhered to. I wish you an early success!