Lately after I split some wood by hand my wrists have been hurting, not bad but enough to notice. It goes away after a few days but comes back if I split again. I can live with the pain but I wonder if I'm damaging something and will regret splitting wood 20 years down the road. I play guitar too so I try to be careful with my hands and wrists. I plan on burning wood for a long time to come, I enjoy splitting wood by hand and getting the exercise so I don't really want to give it up, but don't want to do any damage to myself either.