Take grip on the the V-bar handle such that your palms face each other. Now lock your thighs under the knee rolls to prevent you from lifting your butt off the seat. Feet should be flat on the floor and your arms now extended. This is the starting position.
Commence the movement by pulling the bar down and squeezing your shoulder blades together. As you bend your elbows, exhale and push your chest through the movement. This will naturally create a reverse curvature in the lower back and will engage the target muscles of the lats.
When the bar just touches your chest, squeeze for a second and then reverse the movement by extending the arms to the starting position, inhaling as you do.