Detailed explanation of posture: standing on the ground in the mountain style, with bent waist, upper body leaning downwards, arms straight forward, palms down on the ground. Lean forward with your center of gravity, touch the ground with your toes, lift your legs straight up, and stand upside down. Then the waist bends backward, the left leg remains straight, the ground is not moving vertically, the right leg moves down, the knee bends, and the right toe touches the ground.
Expand the data because arm strength is not a strength that can be improved by relying solely on arm muscles. If only the muscles of the arm were bigger and stronger. Then, the bending strength of one arm may be improved, but the thrust, endurance and tension of the arm are not much stronger as a whole. Your arm strength can only be improved obviously when you do small bends, such as lifting dumbbells for a short time and arm wrestling.
However, when the parts that need to exert strength are not only the arms, such as lifting heavy objects, doing push-ups, tug-of-war, etc., the short board effect will appear because the muscles in other parts are not as strong as the arms. You will find that your arms are strong, but you just can't lift many things, push-ups are rare, and tug-of-war always loses.