6. Long Head (triceps)
One arm overhead cable extensions are a way to go if you wish to really work on your long heads. Of course, this is the largest part of the arm muscle.
![Easiest, Fastest Muscle to Build](https://imonkey-blog.imgix.net/blog/wp-content/uploads/2018/02/04151216/man-2037255_960_720.jpg?auto=fortmat&fit=clip&expires=1753142400&width=480&height=304)
Pixabay/ Public Domain
One arm overhead cable extensions are a way to go if you wish to really work on your long heads. Of course, this is the largest part of the arm muscle.
Pixabay/ Public Domain