Activation of the gluteus maximus and hamstring muscles during prone hip extension with knee flexion in three hip abduction positions. Kang SY, Jeon HS, Kwon O, Cynn HS and Choi B. Man Ther. 2013 Aug;18(4):303-7. doi: 10.1016/j.math.2012.11.006. Epub 2013 Jan 9.
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