In Chicago a lot of guys also do the muay thai class and there are some nasty shins. In drills some of the guy's lockdowns are brutal. One guy who I cant remember his name had me in agony just in drills, his shin felt like a piece of angle iron. If it was live rolls and he was squeezing 100% I would have definitely tapped. Javeir with his short legs got me close to tapping just in a drill once. Ive had a couple of deep bruises and sorenes that last a couple of days but nothing more. Seems to be worse in drilling when you arent resisting.