1-Your body should undulate throughout the stroke in a wave like motion.
2-Lead with your forehead not your chin.
3-Keep Your body as close to the surface of the water as you can. Sinking down into the water creates drag.
4-Fingertips not thumbs down when hands enter water.
5-Arms should be shoulder width apart on entry. Having arms at shoulder width is your most optimal power position in both Free and Fly.
6- Pull should be through the center of your body.
7- When breathing chin should skim the top of the water.
8- Hips and heels should be at the water line not under the water.
9- Dolphin Kick begins at the hips not the knees.
10- Keep your legs close together. Do not bow legs when taking a breath. Using a pull buoy at practice is a good way to stop that bad habit!