This is the joint that is most easily damaged by locks applied on the ground

Fancy leglocks from Sambo, Shooto and CSW that actually work! Go to http://www.grapplearts.com/Blog/blog1 for more tips, articles, techniques, drills, interviews and videos by BJJ black belt and CSW instructor Stephan Kesting

How to stabilize the sidemount on bigger people and then submit them. From the Takedowns & Top Position Gameplan app for iOS & Android http://www.grapplearts.com/Blog/takedowns-top-position-gameplan-app/

Also available as an instructional DVD set, ‘How to Defeat the Bigger, Stronger Opponent, Series 2, with Brandon ‘Wolverine’ Mullins.’ More information about that instructional set here: http://www.grapplearts.com/biggerstronger2