The first thin arm recipe:

1. Hold a dumbbell, a bottle filled with water (or sand) or simply use two bricks, straighten from front to top and then back, remember to do this next to your ear.

2. Put it down slowly and repeat this action 20 times. When you finish, your upper arm will feel sour. That's right. Do three groups every day, 20 times in each group.

The second secret of thin arms:

Lift the right arm, bend the left scapula backward, press the joint of the right arm with the left hand, touch the left scapula for 5 seconds, then lift it and switch sides. Do two groups every day, each group 15 times. This is a stretching action, so we should pay attention to what we can do to prevent strain.

The third secret of thin arms:

1. Stand with your hands straight forward and your feet shoulder width apart.

2. Draw a circle with both hands and draw a circle outward for 20 times.

3. Draw a circle inward 20 times. Three groups a day. Note: You don't need to draw a big circle. Use the strength of your arms, not your palms.

The fourth secret of thin arms:

1. Stand up straight, spread your feet about shoulder width, spread your arms to both sides, and slowly turn forward. The point is to tighten the muscles on the upper arm.

2. Stand up straight, spread your feet about shoulder width, spread your arms to both sides, and turn around slowly. This is mainly to tighten the muscles of the arms and chest.

Note: don't draw the circle too big, so as not to hurt the joints of the shoulders.