Kim, Jung Kyu, and Yong Chul Choi. “The Effect of Short-Term Off-Season Cross-Country Ski Training on Body Composition, Physical Fitness, and Isokinetic Muscle Functions of Cross-Country Skiers”. Journal of Men’s Health 16, no. 1 (March 25, 2020): e63-e74. Accessed August 7, 2020. https://www.jomh.org/index.php/JMH/article/view/201.