Figure 1. Lateral Spine Rotators

The Lateral Spine Rotators are:

1) External Abdominal Oblique
2) Rotatores Spinae
3) Multifidus Spinae

The Lateral Spine Rotators function to rotate your upper body to the opposite side of where the contraction is taking place. In Figure 2 below, the athlete is performing a situp where the front of his upper body has rotated to his left.  This action is caused by contraction of the lateral spine rotators on his right side.

Figure 2.

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