Final answer:
True, every physical activity session should indeed begin with a warm-up and end with a cool-down to prevent injuries, regulate blood flow, and help the body adapt to changes in physical stress levels.
Step-by-step explanation:
The statement that every physical activity session should begin with a warm-up and end with an appropriate cool-down is true. A warm-up prepares the body for exercise by gradually increasing the heart rate and circulation; this loosens the joints and increases blood flow to the muscles, thereby reducing the risk of injury. Stretching exercises may be included to improve flexibility. A cool-down, on the other hand, allows a gradual decrease in intensity, helping to regulate blood flow, prevent muscle stiffness, and reduce the risk of dizziness or fainting. Both warming up and cooling down are essential parts of a workout routine because they help transition the body to and from a state of rest. The importance of these practices is underscored by the fact that when exercising, the body generates excess heat due to inefficiencies in energy conversion, which needs to be managed to prevent overheating and to ensure optimal body function.