I once took part on a seminar to improve on presentation skills. We had to present on a topic and we were recorded. You can later watch yourself and see how you

I once took part on a seminar to improve on presentation skills. We had to present on a topic and we were recorded. You can later watch yourself and see how you sound, how much you hurry through sentences, etc. We repeated the process and within one hour you could see substantial improvements in everyone.