Side Lying Horizontal Abduction
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Side-lying dumbbell raise that isolates the posterior deltoid through its key movement, horizontal abduction.
Detail
Side-lying horizontal abduction is listed as an exercise for the posterior deltoid. The posterior deltoid performs horizontal abduction, backward extension, and external rotation; the key training movement is horizontal abduction (extension). The posterior deltoid is the most under-emphasized of the three deltoid heads, and its movements are rarely done properly.
Key facts
- Primary: Posterior Deltoid.
- Movement: horizontal abduction (the key posterior-deltoid action).
Connections
- Posterior Deltoid — primary mover.
- Horizontal Extension (Abduction) — the joint action.
- Bent-Over Barbell Row / Dumbbell Shoulder Extensions — companion posterior-deltoid exercises.
Promoted to spine
This module is now the structured exercise record ex.side-lying-horizontal-abduction
(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.