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The Importance of Physical Activity: Section 13-1 Vocabulary Physical Activity: Any movement that requires large muscle groups to work. Endorphins: Chemicals that block pain messages from reaching brain cells and produce feelings of pleasure. Physical Fitness: Having the energy and strength to participate in a variety of activities. Body Composition: A measure of how much body fat a person has, as compared to muscle and bone. Aerobic Exercise: An ongoing physical activity that raises your breathing and heart rates. Anaerobic Exercise: Intense physical activity that lasts for a few seconds to a few minutes. Isometric Exercise: Exercise in which muscles but very little body movement occurs. An example is a plank. Isotonic Exercise: Exercise that involves contracting and relaxing muscles through the full range of their joints motion. An example is a push up. Isokinetic Exercise: Exercise performed with machines that ensure muscles contract at a constant rate.