6. athletes warm up to ensure their joints are flexible. flexible joints are a. naturally occurring as you move further into your fitness program. b. only a concern for cross-training athletes. c. important so you can run faster or reach farther. d. important to prevent athletic injury.

I would say d dude. The joints in our body if not properly stretched before an activity could break or sprained while playing if not used properly. The body is like a machine. If one part of it breaks the rest of its functions performances are affected.

Warm up, exercise, cool down

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.