STARTING POSITION:
Grab the pull up bar with your hands slightly wider than shoulder width apart and with your palms facing forward. Contract your pelvic floor and core while keeping your chest up.
MOVEMENT:
Move your knees towards the torso until your thighs are parallel to the floor while you exhale. Move your knees towards your right side and then move them to your left side. The knees should be at the same height at all times. Return to the starting position in a smooth movement.
TIPS: Focus on slow and controlled movement.