Bici A, Kasa A. Effects of 8-week HIIT (Fartlek) combined with Change of Direction (COD) training on aerobic and anaerobic capacity in 18-year-old soccer players. sci. j. sport perform. [Internet]. 2025 Aug. 23 [cited 2025 Sep. 23];4(4):557-69. Available from: https://sjsp.aearedo.es/index.php/sjsp/article/view/hiit-cod-improve-soccer-players-fitness