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Serratus Posterior后锯肌

Back · Deep (L3) · Posterior · 3 exercises

Function

An accessory breathing muscle attached to the back of the ribs: the superior group lifts the ribs to assist inhalation, the inferior group lowers them to assist exhalation. A participant in the breathing rhythm of heavy training.

Best Exercises & Form Cues

• Deep Breathing Drill

  Equipment

  Bodyweight (supine is best)

  Sets & Reps

  3-5 rounds × 5-8 deep breaths

  How to do it

  Lying with knees bent, one hand on the chest, one on the belly; inhale through the nose so the belly and lower ribs (posterior serratus/intercostals) expand in all directions; exhale over 6-8 seconds; feel the side ribs widen.

  Common mistakes

  Shallow chest-only breathing, shrugging as you inhale, exhaling too fast

• Yoga Stretching

  Equipment

  Yoga mat

  Sets & Reps

  2-3 rounds × 30-60 s per pose

  How to do it

  Choose chest-opening and side-body poses (cat-cow, side stretch, child's pose...); movement follows the breath — inhale to expand the side ribs, exhale to deepen; never bounce.

  Common mistakes

  Bouncing into the stretch, breath-holding, forcing poses beyond ability

• Intercostal Breathing

  Equipment

  Band around the lower ribs (optional)

  Sets & Reps

  2-3 rounds × 8-10 breaths

  How to do it

  Wrap the band around the lower ribs, holding both ends; as you inhale, actively push the band outward in all directions (feel the intercostals and posterior serratus expand); as you exhale, the ribs draw back in; slow in, slow out.

  Common mistakes

  Band too tight (restricting breath), shrugging inhalations, rushed tempo

Stretching & Recovery

• Seated rotation with deep breathing
• Side child's pose

Other muscles in the Back

Trapezius (Upper) · Trapezius (Mid/Lower) · Latissimus Dorsi · Teres Major · Rhomboids · Levator Scapulae · Erector Spinae · Quadratus Lumborum · Semispinalis Capitis