What is the reason why you can't rotate your arms properly when swimming?

Swimming, Triathlon and general sports videos are regularly updated on my YouTube channel. Currently, the swimming course according to the Japanese program/lesson plan has been taught at Fuji Swimming Club Vietnam. At the same time, I also run Triathlon and swimming related seminars on an irregular schedule. Groups and individuals who would like to cooperate with us, please contact us with the information below. ☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★ 【Profile】 Ayusawa Takanori Teaching experience: Swimming/Competition: From 2004 to present Triathlon: From 2014 to present Triathlon Coach Accredited by Japan Sports Association Triathlon Coach Accredited by Japan Triathlon Federation Swimming Instructor of Japan Sports Association ☆　★　☆　★　☆　★ Fuji Swimming Club Vietnam Mail: info@fujiswimmingclub.com FB(FujiSC):   / fujiswimmingclub   Website: https://www.fujiswimmingclub.com Youtube(Ayusawa): https://bit.ly/fujiswimmingclub Youtube(Fuji Swimming Club):    / @fujiswimmingclub4632   #swimming #triathlon #swim #howtoswim #openwaterswimming #水泳 #スイミング #競泳 #トライアスロン #水泳教室 #bơilội #lớphọcbơi #bamônphốihợp #bơi #yêubơilội