Squats and lunges are co-rulers of the leg-building empire. Ideally, you’ll find time for both in your lower-body strength-building routine, but if you only have the time or patience for one -- how do you choose? Neither exercise is truly superior to the other, but one may be better suited to specific fitness goals.

According to the Centers for Disease Control and Prevention, until 2000, strep pneumonia causes 100,000 to 135,000 hospitalizations per year. Because of the pneumonia vaccine this rate has decreased to 13 cases per 100,000 people, says the CDC.