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Consistency. Your ability to stay on point on a consistent basis will matter much more than any other factor.
Getting enough rest, engaging in physical activity and getting proper nutrition.
VO2max. This is one important factor (regarding lung function) which determines the total capacity for physical activity, along with muscle conditioning, nutritional factors and others.
The more you exercise, the more you can eat without getting fat!
The most important factor affecting the baby's health is the mother's nutrition.
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How much physical activity a person participated in over their lifetime and how active they are in their later years.
Nutrition is an important factor in bodybuilding. However it is less important than actual weight training. A good high protein diet is helpful in building muscle mass.
Lack of physical activity
Selective redistribution of blood is an important factor in increasing performance during physical activity arteries dilate and constrict during this process