"[Rotator cuff tear] also commonly affects orchestra conductors, choral conductors, and drummers (due, again, to swinging motions)." - http://en.wikipedia.org/w

"[Rotator cuff tear] also commonly affects orchestra conductors, choral conductors, and drummers (due, again, to swinging motions)." - http://en.wikipedia.org/wiki/Rotator_cuff#Rotator_cuff_tear http://en.wikipedia.org/wiki/Rotator_cuff#Rotator_cuff_tear I wonder if this could be a side effect of Leap. The motions required are not as violent as those of conductors, but then again there are finer/weaker muscles in our wrists/fingers that could be affected.