Marcelo, Greg, and Victor briefly review the control and legwork associated with the Under Hook and Head Control Bridge Sweep from Half Guard. A common mistake is the choice in Gable Grip orientation; the palm of the forearm that is bracing against your opponent's shoulder should face you -- as if it were in position for performing a pull-up exercise on a bar. Your other arm acts as an underhook and will help knock away his ability to post against the roll. As for the legs, switch your half guard hook from inside to outside, allowing you to block his leg from posting while you post your inside foot to bridge.