Thanks for the advice.

Quote Originally Posted by bigragu

quit throwing your jabs so hard......throw them at about 50-60% for 2 3-min rounds until you have warmed up your elbows....then at the most you want to throw them at 70% never thow at full power unless your hitting something...if you do throw to hard you will hyperextend your elbows....possibly injure your shoulders as well......
Didn't consider this, most probably the cause.
By the way, can you hurt yourself this way in a real fight? Guess you don't completely miss the jab often, but does this happen?