Dumbbell Tricep Extension

Definition

The dumbbell tricep extension is an isolation exercise where the athlete holds a dumbbell overhead with both hands (or one hand) and lowers it behind the head by bending the elbows, then extends back to lockout. The overhead position stretches the long head of the triceps more than any other tricep exercise, building the pressing endurance HYROX^® athletes need for wall balls and sled pushes.

Technique & Form

1. Starting position - Stand or sit with a dumbbell held overhead using both hands wrapped around the handle. Arms fully extended, elbows close to the ears.
2. Lowering phase - Bend the elbows to lower the dumbbell behind the head. The upper arms stay fixed; only the forearms move. Lower until a deep stretch is felt in the triceps.
3. Extension phase - Extend the elbows to press the dumbbell back overhead to full lockout.
4. Breathing - Inhale as you lower; exhale as you extend.
5. Tempo - 2 seconds down, 1 second up.

Muscles Worked

• Primary movers: Triceps brachii (long head emphasis)
• Stabilizers: Core, anterior deltoid, serratus anterior

Common Mistakes

• Elbows flaring wide - Reduces long-head stretch. Fix: keep the elbows pointing forward, close to the ears.
• Arching the lower back - Core disengagement under overhead load. Fix: brace the core and keep the ribs down.

Benefits

• Maximum stretch on the tricep long head, which crosses the shoulder joint.
• Builds the overhead pressing endurance needed for high-rep wall balls.
• Simple movement requiring a single dumbbell.

HYROX^® Context

The tricep extension supports Wall Balls and Sled Push stations by building tricep endurance for sustained pressing. The overhead position directly mimics the final phase of a wall ball throw. Program 2-3 sets of 10-15 reps as a pressing accessory, pairing with dumbbell skullcrushers and dumbbell shoulder press.

Variations & Alternatives

• Dumbbell Skullcrusher - Lying tricep extension for heavier loading.
• Dumbbell Kickback - Hinged-over isolation for peak contraction.
• Dumbbell Push Press - Compound overhead press under heavier loads.

FAQ

Should I use one or two hands? Two hands (one dumbbell) for heavier loads; one hand (single dumbbell) for unilateral work and correcting imbalances. Start with two hands.

What weight should I use? 8-15 kg for two-handed; 4-10 kg for single-arm. Focus on a full stretch at the bottom and complete lockout at the top.

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