Take a seated position on the dip machine locking your legs under the knee rolls and placing your feet flat on the floor. Your core is tight and your hands are placed palms down on the machine handles with elbows pointing back rather than flaring sideways. This is the starting position.
Commence the movement by pushing the weight through the triceps and extending the arm so that the elbow joint opens up and the machine handles push down. Exhale through the movement.
When the arm is almost fully extended and the triceps is at maximum contraction, reverse the movement back to the starting position, inhaling as you do.