Which one of the following choices is a good way to overcome lack of motivation as a barrier to physical activity?
a. choose activities that involve minimal risk.
b. invite a friend to exercise with you on a regular basis.
c. schedule activity for times when you’re feeling energetic.
d. identify available time slots for exercising.

Mason joined the water polo team at his school. as part of his conditioning, mason's coach requires a 25-minute run during practice. mason's heart rate reaches 125 beats per minute, but his target heart rate zone is 138—183 beats per minute. what should mason do to get the most benefit for his heart? increase the amount of time he runs increase the speed at which he runs decrease the amount of time he runs decrease the speed at which he runs