The answer is D. weight control is the primary benefit of exercise
You can add ten pounds of muscle mass by next week
Heart attack
When any muscle in the body is starved of oxygen-rich blood, it can cause considerable pain. The heart muscle is no different. The chest pain that comes with a heart attack may feel like a sharp, stabbing sensation, or it may seem more like tightness or pressure in your chest.
so our body organs can function properly. being psychically fit makes us more active. we wont be tired. our minds can be at rest and we can relax knowing we have a healthy and fresh mind.
also exercise releases endomorphines and this is what makes a person more happier.