Single-leg sled pushes and pulls involve emphasizing one leg to move the sled on each step, which is especially good if you're trying to focus on a weaker side.
An easy way to implement these single-leg sled push and pull variations is to simply perform half the distance or duration with one leg and do the second half with the other leg.
As a young man in the iron game, Mike was surrounded by people who drank the pro-bodybuilder Kool-Aid. He never squatted ('cause it hurts your knees) and never deadlifted. Now he knows better.