Althoug to be honest, most/all of it applies to any martial arts skill 
http://grapplearts.com/Gracie-Mag-Jiu-jitsu-Manual.htm

http://grapplearts.com/Gracie-Mag-Jiu-jitsu-Manual.htm
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
4. Repeat the moves over and over
Leaders of victorious academies in Jiu-Jitsu and MMA, Andre Pederneiras (Nova Uniao) and Sylvio Behring (Winner-Behring) donÂ’t fear being repetitive when they assure that the motto is to persist and persist and then persist some more when it comes to position-training.
(surf, for instance, is practised by nine in every ten fighters)
doc clean said:Good article.
But ...
really?