It means mocking "small skill, big temper"

If you can really practice to 45cm, you can throw it at will. China people's size, the average person can't even pass 40, so don't throw it away.

So the gym can put up a notice saying that the arm circumference is less than 45, don't smash equipment, the chest circumference is only 120, and don't train shirtless. ...

Please observe the fitness etiquette.