Pull your body up by driving your elbows down towards your hips, aiming to bring your chest up to the bar, this is known as the pull-up phase.
As your chest reaches the bar, quickly transition your hands from a pull-up grip to a dip grip by rolling your wrists over the bar, this is known as the transition phase.
Once your wrists are over the bar and your chest is close to it, push your body up until your arms are fully extended, this is the dip phase.
Lower yourself back down to the starting position in a controlled manner and repeat the exercise.