Sukwong, Thanatpong, Sonthaya Sriramatr, and Dittachai Chankuna. “COMPARISON OF EXERCISE BEHAVIOR OF THE PERSONAL FITNESS TRAINER”. Academic Journal of Thailand National Sports University 13, no. 1 (December 31, 2020): 81–90. Accessed May 19, 2024. https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/248339.