The great enemy of clear language is insincerity. When there is a gap between one's real and one's declared aims one turns as it were instinctively to long words and exhausted idioms like a cuttlefish squirting out ink.
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.