arunmek, wisanu (2022) “EFFECT OF CORE MUSCLES TRAINING ON STRENGTH AND SPEED OF 50 METERS CRAWL STROKE”, Academic Journal of Thailand National Sports University. Chonburi, Thailand, 14(2), pp. 253–264. available at: https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/248633 (accessed: 19 September 2026).