The warm-up period of a workout is important because it                a.  a person to exercise for a longer period of time.      b.  ensures the effectiveness of the workout.      c.  guarantees an injury-free workout.      d.  slowly and safely raises heart rate. 

Which of the following statements is true about body composition? a. body composition is the percentage of fat to lean body mass. b. body composition is a measure of one's body weight. c. body composition is a measure of one's essential body fat. d. body composition is not a good indicator of overall health. select the best answer from the choices provided. a