Relative Stiffness

Relative Stiffness

When we actively engage serratus anterior in core/ flexion based drills we effectively shut down the involvement of it’s antagonist muscles, of most note in this example the latissimus dorsi. This increased stiffness created by the serratus anterior effectively shuts down the lats ability to extend the lower back and drive the rib cage anteriorly. This is because the serratus anterior’s function is to shift the rib cage BACK and DOWN relative to the scapluae, the direct opposite effect the lat has on the rib cage of FORWARD and UP (extension of the lumbar spine and lower thoracic spine).

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