The trapezius muscle can act as a fixator when the biceps ... to control the flexion of the elbow so the body is lowered under control down towards the floor. The triceps are the antagonist.

When the deep stabilizing muscles of the shoulder, such as the lower trapezius, serratus anterior ... Use a pad or pillow under your head to keep your neck aligned with your spine.

trapezius distalis and m. serratus anterior on the convex side appeared to be weaker compared to concave side, and m. rhomboideus on the concave side appeared to be weaker compared to convex side.