ผู้วิจัยจึงสนใจศึกษาว่าถ้านักกีฬาฟุตบอลมีการยืดกล้ามเนื้อที่ถูกวิธีจนทำให้มีความยืดหยุ่นของกล้ามเนื้อ Psoas major ดีขึ้น จะส่งผลทำให้นักกีฬาฟุตบอลมีประสิทธิภาพในการเล่นฟุตบอลดีขึ้นหรือไม่
Research, therefore, pursue that if athletes are stretching muscles soccer is making way flexibility of muscles, Psoas major, will result in better athlete performance in soccer players football has improved or not.
The research was to study if the athlete has to stretch the muscles to be flexible Psoas major muscle will result in better performance in football to play football better or not.
The study that if the football players have to stretch the muscles that way until the flexibility of muscle Psoas major better. The football players are effective to play football better?