[Arm-supported one-hand curl] mainly exercises the biceps. Sit with your legs apart, raise your head and chest, turn your upper body slightly to the side holding the dumbbell, hold the dumbbell in one hand, place your elbow on the inner thigh close to the knee, and support the other knee with the other arm. Use your upper arms to lift the dumbbells to the highest position possible, stop for a while, and then restore them under the control of your upper arms. The upper body can be slightly tilted to the side of the weight-bearing side to assist in exerting force. Super high-definition big picture.