The ability of an organism to maintain its internal stability against external environmental changes thereby developing the constant internal environment within the organism is known as Homeostasis.
Homeostasis is deeply produced in warm-blooded animals to control body temperature, fluid balance, blood pH, and oxygen pressure, concentration of chemicals,etc.
During homeostasis process entire body system work together to maintain the balance. If not controlled or if disrupted the process will result in disease or disorder.
It is impotent to behave in PE class because misbehaving will also lead to distraction in many ways. If someone is being disruptive in PE class it was distract the whole class and most likely put the whole class behind.