10. Sit and reach improves the hamstring of the feet, what component is affected? a. Power b. Flexibility c. Balance d. Speed 11. Weight lifting or carrying heavy objects will improve what component of physical fitness? a. Strength b. Flexibility c. Endurance d. Agility 12. A physical activity that focuses on the strength of upper extremities. a. curl-ups b. Push-up c. sit and reach d. 3-min. step test 13. Walking and jogging improves the strength and flexibility of the body. a. Agree b. Maybe c. True d. False 14. This physical activity focuses on the ability of the lungs and heart to pump & deliver oxygen a. Strength b. Curl-ups c. Zipper test d. 3 min. step-test 15. An activity or exercise that focuses on measuring the strength of the abdomen. a. running b. jumping c. curl-ups d. split