For your enjoyment, follow the link below. I saw this on the 4 States QRP club reflector, it's a U.S. Navy training film from 1944 on the proper way to send morse code with a straight key. It only lasts 10 mins, there are a couple of minutes of a black screen at the end, so when the films says The End, it's over. Also you can skip the commercial after about 10 seconds on the bottom right of the screen.
What is a glass arm?
How long should you be able to send using proper form?
How far apart should the contacts be?
What are the working parts of the body when sending CW?