Beat a defender with the step-over. Drive at him, swing the foot over the ball with a convincing shoulder drop, push it the other way, and accelerate into the space.
The player drives at a defender, plays a step-over to sell one direction, then pushes the ball the other way and accelerates past. Emphasise a convincing body feint, dropping the shoulder, and exploding away after the touch. Practise both directions and single and double step-overs. Rotate the roles.
The step-over is the first proper beat-your-man move most players learn, and it is the one most often performed badly, because players practise the foot and ignore the body. Swinging a foot around the ball is not a step-over. It is a decoration that no defender has ever been fooled by.
What actually moves a defender is the shoulder. As the foot passes over the ball the shoulder drops in the same direction, and it is that weight shift, not the foot, that makes a defender plant on the wrong side. A player who keeps his chest square while his foot circles the ball has told the defender nothing, and the touch that follows runs straight into him.
The second thing that decides it is distance. Executed too far out, the defender simply resets and the move buys nothing. Executed too close, there is no room for the push and the ball hits his feet. The window is roughly a yard and a half, close enough that he has to commit, far enough that the touch away has somewhere to go.
The third is what happens after. A step-over that beats a defender and is followed by a normal touch has not beaten anybody, because he recovers. The acceleration out of the move is not a flourish, it is the half of the move that creates the separation. Coach the first two touches after the skill as hard as the skill itself.
Save it to your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block. Or start from a blank pitch and build your own.