Hardening of the arteries is an example of the leading cause of death in the unites states.

a. diabetes

b. lung cancer

c. heart disease

d. skin cancer

C. heart disease

Other symptoms may include

. sudden weakness

. paralysis (not being able to move) or numbness in body

. confusion

. trouble speaking or understanding speech

. trouble seeing in one or both eyes

. problems breathing

. Dizziness, trouble walking, loss of balance or coordination, and unexplained falls

. loss of consciousness

. sudden and severe head ache

Loyalty, this is one of the most important

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)