Standing cable machine, straight-bar or angled bar attachment.
Proper Exercise Technique
Take a few steps back from the machine and using an overhand grip, space your hands on the bar slightly less than shoulder-with apart. You can also perform this movement with one foot in front of the other if it feels more comfortable. Lean forward and start with the bar touching your forehead. With force, drive the weight down to your waist by extending your elbows. Make sure to keep your elbows close to your sides at all times. Once you have locked your elbows out at the bottom, squeeze your triceps and then return the bar back to the starting position by touching your forehead.
Tricep Cable Pushdown Exercise - Start Position
Tricep Cable Pushdown Exercise - Finish Position
Tips: Make sure to move naturally throughout this movement by leaning forward as you drive the weight down to your waist. By moving naturally you will be able to use more weight and maximize muscle stimulation. Also remember to use a full range of motion by bringing the bar all the way up to your forehead and fulling locking out at the bottom of the movement.