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.
Alchemy is the art of far and near and I think poetry is alchemy in that way. It's delightful to distort size to see something that's tiny as though it were vast.