Finally, before the article gets too long, let's focus on the arms. The arm swing is very important. You can't take two steps and one arm swing. You can't take a long stride with a short arm swing. You can't have a quick leg turnover and slow arms.
Arms sometimes are the best focal point for a runner.
Well, put your hands in front of you like you were praying and then open your hands up so that your palms are facing the ground and the tips of your thumbs are still touching. Your hands are where you want them to be when they are in front of you. Another reference I sometimes use is that your arm should be extended about as far as a hand shake. As far as the hands are concerned, a lot of people say it makes little difference. I always like to promote a partially closed hand with the thumb on top.