Let's discuss how we can adjust the one-arm pull-up to make it as efficient as possible. To simplify this we take a look at two different things from one perspective, which leads to the 'strange' way the loading arms are marked. Note that this is more a qualitative way to look at it, it's not showing the real dimensions.
LEVEL OF HORIZONTAL ARM ADDUCTION (FRONT VIEW) 上臂水平內收的程度(前面觀)
I know want you to imagine you are looking from the left side of the picture to the front side of my body. The less my arm is horizontal adducted, so the bigger the distance of my elbow to the line of force is, the longer the force arm is. A long force arm means we need to produce more force to move the same weight.
LEVEL OF HORIZONTAL ARM ADDUCTION (SIDE VIEW) 上臂水平內收的程度(側面觀)
Now just take a look at the picture as it's taken. By opening up the angle between our elbow and body, so by using less horizontal addition (adduction), we are increasing the leverage on the elbow and so we are putting more stress on our arm flexors. Also from the side view, you can see, that the upper arm gets 'shorter' which creates an advantageous load arm.
if you want to make oap's (OAP’s) efficient and do them with minimal force output, keep your pulling arm close to your body. Advanced athletes can use this concept the other way around to increase the difficulty of this element.
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