Yamashita, Daichi, Shinto Kinoshita, and Takeshi Sakaguchi. “Annual Changes in the Physical Characteristics of Japanese Division I Collegiate American Football Players”. International Journal of Strength and Conditioning 3, no. 1 (January 20, 2023). Accessed March 3, 2024. https://journal.iusca.org/index.php/Journal/article/view/131.