2. Then take two dumbbells in each hand, open them, raise your hands and bend your elbows.

3. Then keep your back straight and your arms on your legs.

4. At this time, let your arm start to lift, then put it down and return to its original state. Do this group of actions 20 times every morning and evening.

Thin back effect: Holding dumbbells for exercise can effectively strengthen the function of back lines. When you move up and down, you will get good muscle exercise and burn heat from your arms to your back, so as to achieve the effect of burning fat quickly and reducing fat.