The correct answer is A.
Q: But how, also, why?
A:

Formula to the solution should explain everything. ^
Answer:
Stretch, exercise, stretch
Explanation:
Answer:
aneurism
Explanation:
Aneurysm is the abnormal dilation of an artery. An aneurysm can rupture and cause bleeding or remain without bursting ...
Physical, social, emotional
Answer:
Subtract your heart's resting rate from your maximum rate. For example, if you are 40 years old, subtract that number from 220; your maximum rate is 180. Next, subtract your resting rate or 80 in this example. Your heart-rate reserve is 100 beats per minute.