When i trained to get to the muscle up i always noticed a bit of discomfort on the negative part of the muscle up, on the inner part of my arm right between my bicep and forearm (opposite to my elbow bone), the discomfort occurs on the negative part right when my body goes below the bar again and i hang.. the pain usually lasts for a few mins and then dissapears but this can sometimes ruin my training sessions.. maybe my muscles still have to get used to this kind of movement, since i havent been into calisthenics for very long? maybe theres something wrong with my technique?? maybe its a tendon being stressed with an unproper arm position? any help would be appreciated.