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Hwang YI, P.t. , Moon PJ, P.t. , Park BJ, P.t. , Ph.d .  Electromyographic Analysis of Quadriceps and Hamstrings Co-activation during Hamstring Strengthening Exercises.  PNF and Movement 2019;17:441-450.  https://doi.org/10.21598/JKPNFA.2019.17.3.441