Biomechanics - A sub-discipline of kinesiology, biomechanics uses applications and mathematical methods of mechanics to figure out how and why the human body ("bio") moves the way it does.

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

FDA (Food & Drug Administration) - It is the US federal agency responsible for the regulation of pharmaceuticals (drugs) and food products

Body fat - the percentage of your body mass that is not composed of lean muscle, water, bones or vital organs

Tissue - a collection of cells of the same or very similar type

Ballistic stretching - bouncing to increase the amount of stretch. Can cause muscle tears and soreness and is not recommended

Intervals - Exercise that alternates high intensity ("work") with easy or light intensity ("recovery"). Used by performance athletes for speed and endurance.

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