# What is an underhook in BJJ?

An underhook threads your arm under your opponent's armpit and up their back, controlling their upper body from inside their arm. Underhooks are fundamental for control in wrestling and BJJ. Having an underhook usually means you can control posture, prevent takedowns, set up your own attacks, and es...

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**Tags:** technique, beginner, gi, no-gi

**Source:** [BJJ Notes Knowledge Base](https://www.bjjnotes.app/knowledge-base/what-is-an-underhook-in-bjj)