Beginner single leg started from the knees, the way many BJJ gyms first teach takedowns. Covers the entry, controlling the heel and collapsing the leg.
One-minute walkthrough of a single leg from inside control: the step-tug setup, level change, head in the ribs and two finishes. A quick reference rather than a deep dive.
Wrestling up from seated guard to a single leg with three finishes: get behind and shelf the leg, intercept the step like a low single, or go between the legs when they sit their weight back.