Rear Bearhug

To escape, throw your arms up as soon as you feel them grabbing
you. At the same time, drop your weight. Then you'll turn around
and hit them low and then high.

Rear Choke

To escape from the rear choke just raise your elbow and turn
around back toward the attacker, quickly applying an open
hand strike to his face.

Escape being Grabbed by Two

Here's how to escape when two people are grabbing you.
Drop your elbow as you drop your weight. Then use your
open hand to hit the person on the other side. Then come
back to back hand the first person.

How to Escape a Headlock

Your four fingers will go behind on the back of the person's neck,
and your thumbs should go into the tender area on slightly back
from the throat. To find it, just feel around for your pulse. Once
you find it, try it on your friends, but be careful. They'll pass out
if you do this too long or try it too many times.