Exercising for health has deep evolutionary roots . Most people do n't exercise enough . Cars , elevators , escalators , shopping carts , and other labor-saving innovations allow us to exist for days without ever significantly elevating our heart rates or breaking a sweat . We should let each other exercise more often , authors suggest .
Exercising for health has deep evolutionary roots . Most people do n't exercise enough . We should let each other exercise more often , authors suggest .