Extension
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Straightening a joint so the bones move apart.
Detail
Extension is a straightening movement that moves bones apart, as when the hand moves away from the shoulder. An exception applies to the shoulder joint: extension there is the return movement from shoulder-joint flexion. Source attributes the movement terminology to Thompson (1989).
Page 148 pairs this shoulder-joint exception with its representative exercises: "Extension — extends the humerus, draws the arm downward to the side. Exercise: dips, push-ups."
Key facts
- Extension = straightening; moving bones apart.
- Example: hand moving away from the shoulder.
- Shoulder exception: extension is the return movement from shoulder flexion.
- Shoulder-joint extension's representative exercises: dips, push-ups (page 148).
Connections
- Flexion — the opposite (bending) movement.
- Spinal Column (Vertebral Column) — spine performs extension as one of its movements.
- Dips / Push-ups — the shoulder-joint-extension exercises page 148 pairs with this definition.
Sources
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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.