Previously I wrote a digest concerning the overall summary. Here are some more specific body details.
For some reason, which I have yet to discover, the shoulder (being one of the most complicated joints with degrees of movement) has to be seated in its socket, like a nailed hammered into a board, before one can connect the mass of the body to the target at the end of the human arm. Shrugs, no idea why, actually. It gets complicated, I would surmise. Shoulder dislocation complicated.
The elbow has to be situated near the ribs or torso, it cannot be flared out unless the range is so long or short that this detail no longer matters. The elbow, being able to only bend in one direction, and that a limited number of degrees, isn’t particularly complicated. When combined with the shoulder, however, it does get messy. Because when people send an impulse to move the wrist and shoulder, often times their shoulder moves as well. One of the benefits of training the foundation of the body in neijia or weijia is being able to consciously or subconsciously control specific body parts, even during the 180 heart beating rate of a life and death fight. Although for training, most people use intense aerobic exercise and I personally, use emotional substitutes that bring on intent and an environment sufficiently close to simulate the actual.
The hands are a little bit strange, due to the wrist. The angle the wrist is rotated depends on the range at which power must be projected. Thus at boxing range, the full or over extension of the elbow and shoulders from their normal alignments, the wrist is rotated with the palm down. And sometimes even with the thumb pointing down, to aid in the push through and rotation. For closer range, such as half arm length, the palm up is used instead. Closed fist or open hand, doesn’t seem to matter much. So even as each joint, the fingers, wrist, and elbow, are not particularly mobile in 3d, when combined together they get messy. Various ancient and more modern styles have hand and elbow structures which fit their predominantly offensive striking tool. Pick your poison.
For visual aides, see Chinaboxer’s channel on Youtube, the male that learned from Bruce Lee’s childhood friend. I’ll be re reviewing his material sometime later.
As for the hip joints, a lot of it is conditioning. It is one of the strongest joints, but also the one most people pay the least attention to in regular life. Its degree of movement is also similar to the shoulders, but normally is not utilized due to flexibility issues. It is the joint that needs the least explaining and the most experience, perhaps right after or before the shoulder joint.