Here is a pre-workout lats attack.
Treat your lats with a rubber band, foam roller and, of course a lacrosse ball. But focus on external rotation. Creating torque first will, stabilize the joint.
Check out more drills on Mobility 101.
Also got some nice ideas from this Lateral flexion MWOD.
Position #2 looks like fun. But you need to be quite flexible to get into the position in the first place.
