Page 754 - Complete Krav maga : the ultimate guide to over 250 self-defense and combative techniques

4. Sweep or punch your back leg forward. (If the attacker allows you to stand up
tall, you can sweep; more often you will be crouched a little, in which case you
should punch your knee forward). Your goal is to pop his leg forward, removing
his base. At the same time, drive your upper body backward and down.