Here are some defensive options from common standing grabs from behind. Aside from the rear choke grab (see a previous video on my channel for that one), these are some solutions for efficiently and effectively getting out of a double arm pin, a bear hug (2 options) and a full-nelson.

Jiu-Jitsu Self-Defense | 4 Options For Grabs From Behind

Hand to Hand, Self Defense, Technique |
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