I am a regional / national level surfer. I do slalom and formularacing. Last year I don't sail as much as I used to. Last weekend with a local race I had the biggest problems holding the boom with my hands. I have these problems espessially using longsleeve wetsuits and large diameter booms. Is there a good exersice for solving this problem? Do I need stronger mussles or longer mussles (stretching)?