There is so much we can work on when mastering Freestyle. One aspect of the stroke that causes a lot of swimmers trouble is head position. Some swimmers tilt their heads up slightly either when they breathe or when their heads are in the water during their strokes. Some swimmers move their heads from side to side, never really finding that perfect alignment position. If any of my old coaches are reading the previous statement, they are all nodding along as I used to be extremely guilty of that one.