The reverse grip pushdown is an excellent exercise for targeting the medial head of the tricep. In addition, the supinated grip makes cheating harder and prevents using the shoulders/chest. I recommend using a lighter weight for 12-15 repetitions while focusing on squeezing the triceps.
How do you activate the medial head tricep?
How do you hit all 3 heads of triceps?
Is it true that triceps are 2/3 of your arm?
The triceps comprise about 2/3 of the muscle in your arm. So why would you not want to focus your attention on them? If you don’t include tricep exercises in your at home workouts then you are only working 1/3 of your arm muscle.