I couldn't have said it any better myself...

A strong body makes the mind strong. As to the
species of exercises, I advise the gun. While this gives moderate
exercise to the body, it gives boldness, enterprise and independence to
the mind. Games played with the ball, and others of that nature, are too
violent for the body and stamp no character on the mind. Let your gun
...therefore be your constant companion of your walks.- Thomas Jefferson