There are four basic movements in arm running:
1. Cyclist: Lie on your back, keep your arms straight, and do the same action as pedaling with both hands. 1 ~ 2 minutes.
2. Flying: Stand, spread your arms horizontally to both sides, slowly flap your arms and do the action of flapping your wings 1 ~ 2 minutes.
3, punching sandbags: imagine hanging a sandbag in front of you, punching sandbags, or boxing with an imaginary opponent, doing 1 ~ 2 minutes.
4. Throw the ball: Throw the ball into the air and catch it. Or throw the ball to the ground and bounce off the wall to catch it. If there is no ball, you can do simulation exercises. Do 10 times on each arm, and do 10 times after a short break.