SEATED OVERHEAD DUMBBELL EXTENSION
Long Head Triceps Builder for Arm Mass
Primary Muscles
Exercise Description
The seated overhead dumbbell extension targets the long head of the triceps through an overhead position. Holding one dumbbell with both hands behind your head, extend your elbows to raise the weight overhead.
How To Perform
Sit on a bench with back support, feet flat on the floor.
Hold one dumbbell with both hands, supporting the weight on your palms under the top plate.
Raise the dumbbell overhead and then lower it behind your head by bending your elbows.
Keep your elbows pointing forward and close together throughout the movement.
Extend your elbows to raise the dumbbell back overhead, fully contracting your triceps.
Lower back down with control, feeling the stretch in your triceps.
Expert Tips
Keep elbows stationary - Only your forearms should move. Keep your upper arms vertical and elbows pointing forward.
Full range of motion - Lower the dumbbell deep for a full stretch, then extend completely for full contraction.
Control the stretch - Don't let the weight pull your elbows back. Maintain control through the entire range.
Use appropriate weight - This exercise requires strict form. Don't go too heavy or your elbows will flare out.
Common Mistakes
Elbows flaring out - Wide elbows reduce triceps engagement and stress shoulders. Keep elbows tucked forward.
Arching lower back - Hyperextension compensates for weight being too heavy. Keep core braced and back neutral.
Incomplete range of motion - Partial reps reduce effectiveness. Use full range for maximum stretch and contraction.
Moving too fast - Momentum reduces time under tension. Use controlled tempo on both phases.
Video Guide – Seated Overhead DB Extension
The seated overhead dumbbell extension is one of the most effective exercises for building the long head of the triceps—the portion that gives your arms that impressive horseshoe shape when developed. The overhead position uniquely stretches the long head because it crosses both the shoulder and elbow joints. This stretch under load creates massive growth stimulus that pressing and pushdown movements simply cannot match.
What makes this exercise particularly valuable is its combination of stretch and metabolic stress. The deep stretch at the bottom position creates mechanical tension in muscle fibers, while the constant tension throughout the movement builds metabolic fatigue. Together, these factors make it one of the best triceps mass builders available. The seated position with back support also provides stability, allowing you to focus entirely on triceps contraction without worrying about balance.
Watch the demonstration video carefully. Notice how the elbows remain fixed in position pointing forward—they don't flare out to the sides or move backward. The upper arms stay vertical while only the forearms move, lowering the weight deep behind the head before extending back to lockout. The core remains braced to prevent lower back hyperextension, and the tempo is controlled throughout both phases of the movement.
Program this exercise 1-2 times per week as part of your arm or push training. It works excellently as either a primary triceps movement for 3-4 sets of 8-10 reps with heavier weight, or as a secondary exercise for 3 sets of 10-12 reps after pressing work. Start conservatively with weight—this is a stretch-position exercise where injury risk is higher with poor form. Progress gradually, focusing on maintaining perfect elbow position and achieving full range of motion. Master this movement and watch your triceps—especially that prized long head—grow dramatically.
Equipment Required
- • Single dumbbell
- • Bench with back support (recommended)