Combination activity is an intermediate level form of mental activity for contraction/relaxation activity. It involves local parts of the body, with one joint as the axis and two bones as leverages, in combined movement of resting muscles during contraction/relaxation. In fact it adds two parts of the body muscles to join this contraction/relaxation activity. Combination activity should start with two points combined, for example as calf combined with thigh, then gradually increasing to three points combination, for example calf, thigh and buttock, then you continue to again increase gradually to four points combination... Each time you are increasing number of combination, each time you are adding one "pulling tendon" sensation or "Pulling-Hanging" sensation, etc. which a new form of internal exercise, new internal sensation, increasing the overall "quality" of physical exercise. Here are some training methods:
4.1 With ankle joint as axis, from heel to toe as opposite side, heel to knee as adjacent side, knee to toe as hypotenuse, all sides forming a right-angle triangle. Sole and calf resting muscles are combining during one contraction/one relaxation exercise. Triangle defined by points 1, 2, 3 in Figure 5-1.
4.2 With knee joint as axis, from knee to hip as opposite side. Here with sole as supportive point, calf and thigh resting muscles are combining during one contraction/one relaxation exercise. Triangle defined by points 1, 3, 4 in Figure 5-1.
4.3 With hip joint as axis. Here you more combination: belly, buttock and thigh resting muscles are
combining during one contraction/one relaxation exercise. Form defined by points 3, 4, 5,6 in Figure 5-1 and 1, 2, 3, 4, 5, 6 in figure 5-1.
4.4 With elbow joint as axis, elbow to shoulder as opposite side, elbow to hand as right-angle line, shoulder to hand as hypotenuse: forming a right-angle triangle. Here arm and forearm resting muscles are combining during one contraction/one relaxation exercise.
4.5 With third metacarpus as axis, thumb and little finger combining and expanding, their fingertip grasping inward. Second, Third and Fourth fingertip stretching forward, palm facing in, wrist hooking downward, shoulder muscle should relax.
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