Filming myself and reviewing the film helps me to become a better teacher because then i can see the specific aspects of my teaching that i need to work on. I can pin point those parts of my teaching that is not very good and then i was watch what i am doing wrong and then practice it and fix it for next time. You could also apply this to sports. When you watch yourself playing a sport then you can find the things you are doing wrong and you can see how you can fix it. I think this hands on way of teaching and learning is very effective and can help anyone improve exceptionally.