When I was going to grade school I remember our music teacher had the worst looking arms EVER! She would be up there directing the music and her arms would flap around long after they stopped moving. I told myself then that I would never have arms like that! Triceps are hard to tone, but if you do pushups and tricep dips, you will win the battle.
Here I am showing how to do the tricep dip. Give these a try and let me know how many you do! Do them daily. Use a counter, chair, bathtub - whatever is convenient for you!