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A neck muscle and the first of the atrophic-weakening muscle groups; trained with neck machines / neck strap with weight plate.
The sternocleidomastoid is listed first among the 8 major muscle groups susceptible to atrophic weakening with aging (Komi, 1992). Source training options include 4-way neck machines and a neck strap with a weight plate; the strength-conditioning program lists left/right lateral flexion as the exercise.
Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.