How does regular exercise make us more alert and energetic?

Suppose you calculate that elasticity of demand for cigarettes is 0.5. you can conclude that: a. demand for cigarettes is elastic b. demand for cigarettes is unitary elastic c. a 1% increase in price of cigarettes will result in a 0.5% decrease in quantity demanded d. a 1% increase in the price of cigarettes will result in a 0.5% increase in quantity demanded.

Which of these best describe the perceived body image of a person suffering from anorexia nervosa? a. accurate b. healthy c. normal d. overweight

Alot of ! why does society places such an emphasis on the value of physical health and wellness? what are the benefits of active living?