A. It's a sign of a Heart attack
It is B) because teenagers brains are still growing.
Answer: Increase the enjoyment of exercising
Explanation: No one likes doing the same thing over and over, it gets boring. You'll more than likely loose motivation and joy quickly if you stick to one exercise.
1) Body size: The greater your height, weight and surface area the greater your metabolic rate
2) Body composition: fat tissues has less metabolic activity as in comparison to muscle tissue.
3) Gender:The BMR or resting metabolic rate averages 5 to 10 percent lower in women as in men.
Hope this helps.
