Many girls do not want to have flabby arms and want to have toned triceps like Madonna. Triceps Kickback (also known as Bent Over Kickback) is an ideal exercise to completely focus and isolate on the triceps. However, this workout requires perfect form to be done successfully.
Steps:

Hold a dumbbell in your right hand and [...]

Triceps Pushdown is an isolation exercise which only the triceps are the only muscle involved.
Steps:

Using a high-cable pulley, grasp a short straight bar with an overhand grip (palms down). You can also use an angled bar (V-bar) or a rope for this exercise. Angled bar or a rope will help to reduce any negative pressure [...]

If you are looking for an isolation exercise for your triceps, I highly recommend One-Arm Dumbbell Tricep Extension.
Steps:

Hold dumbbell in right hand and raise overhead to arm’s length.
Stand straight up, with your head up and feet at shoulder width. Keep upper arm close to your head.
Lower dumbbell in a semicircular motion behind your head [...]

Triceps dip is a compound exercise which triceps are the main muscle involved in addition to chest and shoulders. Dips work all three heads of the triceps muscles at once. The triceps brachii has three heads: the lateral, medial, and long heads.
Often called the “upper body squat,” dips are highly recommended for any [...]