A lot of times just stretching out your bicep or your tricep can help with that. To do a bicep stretch, find a doorway and put the palm of your hand on one of the door jams. Then, step forward through the doorway, keeping your elbow straight. That should really stretch out the front of the elbow. For a tricep stretch, I find taking a lacrosse ball, tennis ball, or even a foam roller, putting it on a table, and then rolling out your tricep on that can be really helpful.