The best reason to warm up before exercising is to
a. prevent injuries
b. reduce muscle strain
c. improve muscle performance
d. all of the above

Warming up before exercising prevents the cause of injuries, reducing muscle strain and improve muscle performance. The answer is letter D. The goal of warming up is to increase body temperature, increase neural activation, warm up the joints for our body to not be shocked during exercising. It will get your blood flowing, clears waste from your muscles, and brings fluids to your joints. It will improve the performance in exercising by actively moving the joints and increase in muscular performance at the same time eliminating injuries along the way. 

Force and balance. you get agility from balance and the force you use, and leverage can only be attained by using the force to get it. hope that

Answerfarmer's market; (b) would be my second choice