I’ve had problems with my upper right arm for ummmm, probably over a year, if not two. Looking at anatomy diagrams, I’d say it’s somewhere around where the deltoid muscle meets the biceps brachii short head causing discomfort.
At one point, after holding my arm straight and then lifting my hand away from my side until it was raised above my head, on the way back down retracing the movement, I’d have to stop and bring my hand back in toward me.
Another problematic movement was windmilling the arm (with left arm relaxed) where on the downward movement the discomfort would require me to stop.
But I’ve slowly been practicing these sorts of exercises over the months until these motions and things seem to be improving.
And then I go out on the mountain bike and bunny hop up a kerb and the problem is practically guarranteed to return.
More recently it occurred to me to try rotating my palms while keeping arms straight down by my side. Left arm fine, but the right, the same area is makes the motion uncomfortable but not preventatively so.
What is this a sympton of? Are there other exercises which would be of greater benefit?
Cheers!