I'm pretty new to double stops. I've used them before, sparingly, but I'm in a jazz duo where the guitarist/composer is writing a lot of new songs using constant double stops. Attached is an example of page from a score showing the last part of a new song where everything is double stopped. Actually, the four-page score is entirely double stopped. Whew! (This particular song is in the style of Jean-Luc Ponty.) My particular issue is playing this steady frequency of double stops is stressing my left forearm (the fingering arm). Usually I play standing up, and I find it's a bit easier playing this music while sitting down. But it's still causing too much stress in the forearm and I'm not sure if I can keep it up. Is this just a matter of building endurance, or are there some tips anyone can offer on how to approach this music technique-wise? Thank you. P.S. fwiw, the tempo of this song is 120 so the double-stopped changes move along at a pretty good clip.