BJJ Move # 29: Back Mount

I don't know why I waited until move #29 for this. It's a very basic position-- ideally, it's where you end a fight. Take an opponent's back and choke him out. From this position, you're almost completely safe from your opponent. You can strangle him from behind, and he can't do much but try to escape.

WARNING! These techniques could result in serious injury or death if practiced incorrectly or even if performed correctly. They should only be practiced with the supervision of an experienced instructor.

Back Mount:
-position
-basic

This is the most advantageous position. There are two basic variations.
In the first variation, your opponent is sitting on the ground and you are sitting behind him. Your body is against his back and you are wrapping your legs around his waist from behind and hooking your insteps inside his legs behind his knees / lower thighs. Your legs are called “hooks” because they secure you to him. Do not cross your feet, or you will be vulnerable to an anklelock.
With your hands, at least initially, a good way to secure yourself to your opponent and hold him in the position is to put one hand underneath an armpit and the other around his neck. Then clasp your hands together across his chest (the “seatbelt” grip).
In this position, you may both be sitting up, but you are also in a strong position if you roll back onto your back or side.
In the second variation on the position, you have an even more dominating advantage—your opponent is on his stomach, and you are on his back with your hooks in. This may happen if you have an inexperienced opponent in a front mount and he rolls over onto his stomach. He was better off where he was before.
If he starts on all fours instead of flat on his belly, you want to “break him down” by (for instance) by holding his right wrist from underneath with your right hand and pressing your hips forward while driving your legs back against his legs.
Keep your hips close to his, keep your hooks in, and control his wrists while you try to strangle him from behind.