Targeting your triceps is important because the assist in all your pressing motions. Isolating your triceps in this way allows you to focus on the stretching and squeezing parts of this motion. These are great exercise to implement at any point in your workout, especially as a superset with chest movements.
This movement can be done sitting or standing. Move safely as you get the weight to your shoulder and up over your head. Keeping your upper arm still and only moving your forearms, stretch and squeeze your triceps to move the weight. Try as a single arm movement as well!