Dumbbell Shoulder Extensions
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Dumbbell shoulder-extension/horizontal-abduction movement for the under-trained posterior deltoid.
Detail
Dumbbell shoulder extensions are listed as an exercise for the posterior deltoid (backward extension; horizontal abduction). The posterior deltoid is the most under-emphasized of the three deltoid heads, and these movements are rarely done properly — the key is horizontal abduction (extension). Other posterior-deltoid exercises include seated row (pronated grip, low seat), bent-over rows (pronated grip), and side-lying horizontal abduction. Listed as an advanced deltoid selection.
Key facts
- Primary: Posterior Deltoid.
- Trains shoulder extension / horizontal abduction.
- Posterior deltoid is the most under-emphasized deltoid head.
Connections
- Posterior Deltoid — primary mover.
- Horizontal Extension (Abduction) — the joint action.
- Bent-Over Barbell Row — companion posterior-deltoid exercise.
- Side Lying Horizontal Abduction — companion posterior-deltoid isolation exercise.
Promoted to spine
This module is now the structured exercise record ex.shoulder-extension
(spine/rear-delt.json).
Sources
Exercise guides
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Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.