This is because the triceps make up 2/3 of your overall upper arm mass, and the long head is the largest of the three individual heads it contains.
Although all 3 heads perform the basic function of elbow extension, the tricep long head is unique in that, unlike the lateral and medial heads, it crosses the shoulder joint and also assists in the function of shoulder extension.
For that reason, the best tricep long head exercises are those that begin with the shoulder in a flexed position, as this lengthens the long head and causes it to take on the majority of the load during the lift.
6 Best Tricep Exercises
1 – One-Arm Overhead Cable Extensions
2 – Overhead Rope Extensions
2 – EZ-Bar Overhead Extensions
4 – Two-Arm Overhead Dumbbell Extensions
5 – One-Arm Overhead Dumbbell Extensions
6 – Dips