Dumbbell - a short bar with weights on each end that can be held in one hand

Heart rate, target zones - Your THR may encompass a large range, but for different performance goals, you may focus on narrower zones within your target spectrum.

Intervals - speed workouts, usually run on a track, with distances and target paces decided before you run. They typically consist of relatively short sprints of 220 yards to 1 mile interspersed with rest periods of slower running

Body fat - What is left when you subtract muscles (body lean),water, bones and vital organs. Usually expressed in a percent.

Weight-bearing exercise - exercise in which you support your weight or lift weight. Lifting weights or doing weight- bearing exercise (such as running, skiing or walking) can help slow down the rate of bone loss and osteoporosis, and therefore reduce fractures

Electrolytes - minerals such as sodium, potassium, calcium and magnesium that act to keep your nerves firing and muscles moving. These minerals are found in foods (potassium- bananas, meat) and modest amounts of electrolytes are a necessary component of a normal diet. Be careful of using sports drinks to replace minerals because of the added calories

Anorexia nervosa - a dangerous psychological disorder dominated by a distorted body self-image. No matter how thin, they see themselves as obese. There is a very strong aversion to eating, so much that the victim may conceal uneaten food, fake weight-ins to conceal weight loss, induce vomiting or exercise excessively. Take suspicion of this condition seriously and consult a physician

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