An obstacle that prevents many americans from exercising is the lack of an exercise partner living too close to a park the lack of need to exercise o a lack of understanding about the importance of fitness

c. the runner should sprint as fast as possible to the finish line.

well, it depends. it is natural to not fall asleep before 11: 00 p.m. teens need about 8-10 hours of sleep each night to function best.

enjoy your day!