Top Tip For Tricep Training

The tricep muscle is comprised of three different heads - the long, lateral and medial head. It's impossible to purely isolated a single head of the tricep, however by the orientation of the upper arm in relation to gravity and to the body, you can affect the percentage of recruitment of each head.

For Example:

From Incline to Perpendicular - the further away your arms are from your navel, the greater the recruitment of the long head of the triceps.
E.g Seated French Presses, Overhead Tricep Extension w/rope.

Flat - Exercises in a flat position tend to recruit more the lateral and long head of the triceps.
E.g Close Grip Bench Press, Lying EZ Bar Tricep Extensions

Decline - The closer your arms are to your torso the greater the contribution of the medial head of the triceps at the top position. At the bottom position the lateral head does most of the work.
E.g Decline Close Grip Bench Press, Decline EZ Bar Tricep Extension.

You may also want to consider hand position. As a general rule, pronating the grip (palms down) increases recruitment of the the lateral head and a supine grip (palms up) increases recruitment of the medial head.

Knowing this information will hopefully add value to your workouts and place new size and strength onto your triceps!