How to write the fourth grade scientific breathing and health experiment report?

How to write the fourth grade scientific breathing and health experiment report? Simulate how the human body breathes. When we pull the ball down, observe the change of the small balloon and think about whether to inhale or breathe at this time. Second, push the ball and skin up again, and then observe the changes of the balloon. When the ball is pulled down, the balloon will expand. At this time, it is pushed up during inhalation. When the ball is pushed up, the balloon will deflate. At this time, it is the exhalation process. The experimental conclusion is that the position of diaphragm decreases when it contracts, and the gas enters the lungs and is completely inhaled. When the diaphragm is relaxed, its position rises, and the gas in the lungs is discharged, completing the exhalation process.