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This kind of flexibility is defined as the opposition or resistance to movement of a joint. In other words, with respect to the forces opposing the movement through any range, not only the magnitude itself. This kind of flexibility is more difficult to measure and, as such, has received little attention in the area of physical education and sports. eccentric contraction refers to elongation of a muscle during contraction. In general endurance (resistance) local muscle is defined as the ability of a muscle group to perform repeated contractions (whether isotonic, isokinetic or eccentric) against a load or to support a contraction (isometric) for a long period of time. However, the muscular endurance can also be defined as the opposite of muscle fatigue. http://healthflyup.com/tst-1700/