Sculling

Front scull

Push off and glide on your stomach with your arms straight ahead of you. Your hands should be just outside your shoulders and between 6 and 8 inches deep. Don't kick.
 
Start with your thumbs down and rotate your hands and wrists 270 degrees. Slide your hands back to their original position and repeat until you reach the end of the pool. Don't paddle, but scull. Don't bend your elbows.

Mid scull

Push off and gide on your stomach with your arms 2 feet deep and just outside and in front of your shoulders. Scull your hands together under your chest and then push back until your arms are fully extended and pointing toward your toes.
 
Slide your hands back to the start position two feet deep and just outside and in front of your shoulders and repeat until you reach the end of the pool.

Final scull

Push off and glide on your stomach with your arms together and stretched straight down under your breast bone. Push back and up. Then flair your hands out. Your palms should be pointing away from your sides.
 
Slide your hands back to the start position straight, together, and under your breast bone. Repeat until you reach the end of the pool.

Combined scull

Push off and glide on your stomach with your arms together, stretched in front of you. Do the breaststroke underwater pull-out without a kick and repeat until you reach the end of the pool.