George's highest target heart rate is 170. yesterday on the stair stepper machine, his heart rate went to 172. what should he do the next time he uses this machine to get the most effective workout?

Which of the following defines scoliosis? a. a posture disorder characterized by the shoulders being rounded and the back hunched b. a posture disorder in which the spine curves up the back like a snake c. a posture disorder characterized by excessive curvature or arch in the lower back d. none of the above