Slow Negative Pull Up Exercise Steps:
Stand on a stool tall enough to allow you to grab the pull-up bar at a chin over the bar height.
Pull your shoulders back and down as tightly as possible. Hold the bar with a slightly wider than shoulder-width, overhand grip, breathe in, and tighten your abdominal and walk off the stool to a hanging position and from the bar and try to keep your legs engaged by crossing them.
Start lowering yourself in a controlled manner while extending your arms. Repeat the movement.
Continue doing this till you reach your rep target.