Grab the pull-up bar with the palms facing forward using the shoulder width grip. As you have both arms extended in front of you holding the bar, bring your torso back around 30 degrees or so while creating a curvature on your lower back and sticking your chest out.
Pull your torso up until the bar touches your upper chest by drawing the shoulders and the upper arms down and back. The upper torso should remain stationary as it moves through space and only the arms should move. The forearms should do no other work other than hold the bar.
After a second on the contracted position, slowly lower your torso back to the starting position when your arms are fully extended and the lats are fully stretched. Repeat the exercise according to the training plan.