Tricep pushdowns are great exercises that effectively target and challenge the tricep. Several versions of the pushdown use different cable attachments to perform the exercise. Both the straight bar and the rope attachments hit the triceps, but each target the muscles at slightly different locations.
Using the rope instead of the straight bar changes the position of the hands during the pushdown. The knuckles face out instead of up which directs more of the work of the pushdown towards the lateral head of the tricep at the outside of the arm. The rope allows for a greater range of motion than the straight bar. The range of motion with teh straight bar usually stops when the bar hits the legs when the arms are fully extended. However, the rope allows the hands to move to either side of the legs when the arms are fully extended. This greater range of motion also allows for an extra squeeze at the bottom of the extension. The added range of motion activates the rear deltoids in addition to targeting the lateral head of the tricep.