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

Anaerobic - literally, "without oxygen." The heart and lungs can't get enough oxygen to the muscles and energy is produced without oxygen. Exercise intense enough to "outrun" the oxygen supply creates lactic acid which builds up in the muscles and causes soreness and fatigue. Sprinting is anaerobic and after its done, one must stop until the oxygen supply has caught up again. Aerobic exercise will make this "recovery period" shorter

Adipose tissue - a specialized type of tissue composed mostly of adipocytes (see above), for storing cellular fat

Target heart rate - the ideal intensity level at which your heart is being exercised but not overworked. Determined by finding your maximum heart rate and taking a percentage (60% to 85%, depending on fitness level) of it

Amino acid score - a measure of the actual amounts of individual amino acids in a food, or in the diet relative to the need for the amino acid. Does not evaluate whether the protein is digestible

Glycogen - a form of stored carbohydrate

Fat - also known as adipose tissue. Animal tissue containing glycerol and fatty acids

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