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 The ovaries, about the size and shape of apples, are located on either side of the uterus and contain egg cells called ova (singular, ovum). 

The primary sex hormone in males is estrogen, which is produced by the testes and the adrenal glands. 

 The testes manufacture testosterone, the hormone that stimulates the development of a male’s secondary sex characteristics and sperm, the male reproductive cells. 

The overload principle is gradually increasing physical challenges—provides the benefits of exercise without the risk of injuries 

Becoming fit does not reduce your risk of major diseases, increases energy and stamina, and may prolong your life.

Occasional exercise, such as the intermittent workouts of “weekend warriors” who are physically active just once or twice a week, can reduce the risk of dying of cancer, cardiovascular disease, or other causes.  

Women express less worry about thinness and less dissatisfaction with their lower rather than their upper bodies.  

Some popular diets are high in protein; others are low in complex carbohydrates. Some allow no fat; others ban sugar or gluten. Which ones work? As long as you are burning more calories than you consume, they all have the potential to stimulate weight loss.

Body composition refers to the distribution of fat-free mass and body fat in the human body. Fat-free mass includes bone, water, muscle, organs, and connective tissue. 

More than half of adults in the United States consume at least four or more sugar-sweetened beverages per day, which researchers calculate could lead to a pound of weight gain every 20 days.