Bong , Eun-Bi, Hyun-Ji Jung, Hyun-Ji Jung, Jeong woo Jeon, Ji-Heon Hong, Jae-Ho Yu, Jin- Seop Kim, and Dong-Yeop Lee. 2020. “The Effects of Nordic Hamstring Exercise on the Different Surface to Muscle Strength, Proprioception and Postural Sway in Healthy Adult”. International Journal of Psychosocial Rehabilitation 24 (7): 1602-10. https://doi.org/10.61841/sec0y189.