Disadvantages: instead, it can exercise vital capacity, and deep exhalation helps to discharge the long-term slow circulation of exhaust gas in the deep lungs. Blow it and it will break, even if it doesn't hurt people, it will be scared. If you can't blow it well, it will be broken if you breathe it in at once. Occasionally, I can exercise my vital capacity.

Benefits: practicing blowing balloons can correct the habit of breathing with your mouth and relieve stress. American sleep breathing experts say that deep breathing and balloon blowing help the air pass through the nose smoothly and can correct the habit of breathing through the mouth to some extent. Try not to take the balloon out of your mouth. Repeat the exercise five times a day to increase the air flow.

Extended data;

When blowing a balloon, you usually take a deep breath until you can't breathe any more, and then hold your breath. Blow into the balloon mouth slowly until it stops blowing. Keep the frequency at 15 to 20 times per minute and practice 2 to 3 times a day. What needs to be reminded here is that the speed of blowing balloons is not fast, and the number of times is not doing it, but trying to blow out the air. This is because this is practicing abdominal breathing. If you work part-time for a long time, it will help to reduce the residual lung volume, improve lung function and delay the progress of chronic lung obstruction.

Reference source; Baidu encyclopedia-blowing balloons