Adjust the height of the platform so that your hips are aligned with the pivot point of the machine. Adjust the padding to have your active leg out roughly between 30 to 45 degrees, with your foot pointing upwards and slightly in front of the other leg.
Start by bringing your leg across you until both of your knees are aligned with one another, then slowly retract back to the starting position. Keep your leg in a consistent position as you sweep it across. To keep stable throughout tense your core and the stationary leg. Repeat for the desired amount of repetitions then switch sides.
Avoid kicking out and using momentum or allowing the torso to sway.