After two months of playing with the tripod and the seated static shoulder flexion (with 5kg weight) I was wondering about how I was doing. I also have a question about shaking. Judging by how my muscles are working/stabilizing, I would have said that I was shaking a lot. However in the video it does not seem to be case, there is some movement, but it does not seem as terrible as I thought it would be. Does mastery of an exercise mean that there should be no reason to even think that there is any shaking going on (e.g. by not feeling any real correcting or stabilising being done) or does mastery mean that there is no visible shaking?
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