I don't specifically work out for shooting, but I do lift weights 4-5 days a week. Since I am working out that many days a week each day is specific to a certain bodypart/group of muscles. Arms, chest, back, legs, shoulders etc... I will say that I am very quick on my followup shots and manage recoil very well, I am sure that lifting weights has something to do with it. For pistol shooting you would probably benefit most from forearm exercises.
This is an amazing site that lets you click on certain bodyparts/muscle groups and they will give you exercises that work each one, and tell you all other muscles that are involved. There are also GIF's (moving images) showing you the proper form for each exercise.
http://www.exrx.net/Lists/Directory.html