The body stands naturally, and the muscles in the back and chest are tight. Hold the dumbbells with both hands and put them at your sides. At the beginning of exercise, bend your elbows with your arms and pull the dumbbell to the chest position, with your palms facing your body. The width between the dumbbells should be larger than the shoulders, so that the deltoid muscles can extend outward to the maximum extent for 3 seconds, and then slowly put down the dumbbells and return to the starting point.
Stand with your body facing the tensioner, adjust the pulley to the highest position, and grasp the cable with both hands. When moving, bend the elbow with the power of the harness at the back of the shoulder and pull the cable down. When the arm is pulled parallel to the ground, keep moving for 3 seconds, and then resume. Please note that when pulling down the cable, tighten the shoulder to make the back of deltoid muscle contract to the extreme.
Sit on the bench with your body facing the instrument, your arms below your elbows, close to the instrument backboard, and your legs on both sides of the bench to keep your torso straight. When exercising, raise your arms horizontally outward, away from your sides. When your arm is parallel to the ground, keep moving for 3 seconds and then return to the starting point. Pay attention to the natural bending of the spine during exercise, inhale when the arm is lifted up, and exhale when it is relaxed down.