From my understanding, the lateral and medial heads are the heads primarily involved with pressing movements, such as triceps dips, close-grip bench press, etc.
I hear from a lot of people that to optimally train the long head of the triceps, you have to do overhead movements like skullcrushers, for example. Apparently, the long head is also the largest head of all the 3.
What is the logic behind doing overhead movements? Are they really necessary? What about other extension exercises? What exercise, in your opinion, is the best to hit the long head?