O Brien, Joey, Declan Browne, Des Earls, and Clare Lodge. “The Effect of A Flywheel Hip Extension Vs A Traditional Hip Extension Exercise on Hamstring Strength”. International Journal of Strength and Conditioning 4, no. 1 (July 12, 2024). Accessed November 3, 2025. https://journal.iusca.org/index.php/Journal/article/view/272.