1. When the weight of the squat exceeds 80% of the maximum squat, it is already a heavy weight for the body. The heavy breathing method is: inhale when squatting, and exhale after standing up. The process of exerting strength is to hold your breath, because holding your breath will enlarge the chest cavity, enhance the pressure on the chest cavity, and provide more strength for the body to complete the action.

2. When the squat weight is less than 50% of my maximum squat weight, it can be judged that the load is light and the body can bear it, so the breathing mode is: exhale when squatting, and inhale after standing up. You don't need to hold your breath in the process of exerting force. This way of breathing is just the opposite of the first one.

3. When the weight of squat is less than 50%-80% of my maximum squat, you can choose one of the above two methods according to your physical condition at that time. If you are energetic and in good health, you can choose the second one. If you are in general physical condition and are afraid of injury, you can choose the first one.