Exercise has numerous health benefits. It conditions your heart and lungs and helps your body fight disease. Many people believe
that exercise can help you look better too. For example, cardiorespiratory exercises can slim your waist and strength-building workouts can enlarge your muscles. Stretching can shape and tone your body.
I believe it's amphetamines. They release chemicals called catecholamines, particularly dopamine. Tolerance to these build very fast making them highly addictive.
