It looks like you're in pain when your arms are turning outward. Here's the thing about tendon overuse pain. For me, doing the exercises themselves are not painful. That's the problem. You think, oh this doesn't hurt. I should be ok. But it's not., and the overuse soreness kicks in very gradually. Next thing you know it's there all day.
First things first, you need to figure out which exercises are stressing those tendons and don't do them for a week...maybe two. Problem is that I'm not smart enough to help you make that determination and someone else will have to step in.
You see turned out arms on BL and German Hang, for sure, if you're working with straight arms. But someone else will have to chime in with their opinion. Once you narrow down what movements stress it, STOP doing them for two weeks, and then when you bring them back start at 20% volume/intensity and work very slowly...5-10%/week increases until you're back to normal.
Can anyone help figure out what pushed his tendons over the edge?
JM