Pops...Added to that, the students who have those issues can actually see themselves making the error, using slow-motion video (sometimes one frame at a time).
Often, just SEEING yourself on video can enable the conscious mind to overcome the bad habit...provided that you know what to do to fix it. A qualified instructor can help you with that.
You can't fix what you don't know about...you can't fix what you can't measure...and you can only fix one thing at a time!
Scott Lee
www.poolknowledge.com