Isotonic contraction - A dynamic muscular contraction used in common weight-training exercises where the muscle moves the limb through a range of motion while contracted. Normally called dynamic training or contractions.

Overtraining - Doing so much exercise over time that your body can't recover. You feel weak, tired, and sore, but you don't want to stop working out. Also, see "burn-out."

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

Calorie - a unit of measurement for the amount of energy that is released from food upon oxidation by the body

Target heart rate - Where most people do their exercise. Usually 60-80 percent of maximum heart rate for moderate activity.

Resting heart rate - see Heart rate, resting

Glucose - a sugar (monosaccharide), sometimes known simply as "sugar"

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