Everyday, as we prepare ourselves for life, we typically get ready in front of a mirror. Although we may feel a certain way or think something looks a certain way, the mirror shows us how we look to the world outside of our mind. The mirror shows us things, like a crooked tie, a missed button or messy hair that we otherwise wouldn't be aware of.
The same thing can be said from watching our selves and bjj. I always encourage my students to study Jiu Jitsu, and if they can, film themselves to compare if what they "think" they are doing and what they are doing are the same things.
For Caio Terra Online, I've taken it a step further by adding commentary. This is something I have been doing for the past year and it has been helpful. Not only do you get to see what I am doing, you can hear what I am thinking as I'm doing it. For this training session I trained with Black Belt Robert Biernacki from Island Jiu Jitsu and he added his commentary as well so you can get both perspectives.