Pilot study (n=15)  Inclusion Criteria:  athletics specialize in projects with excessive hip range of motion, e.g. soccer, track and fields, hockey, etc. training for at least 2.5 hrs/week  Exclusion Criteria:  any symptoms or surgery history on lumbar or lower extremities any neurological disease affects on motor imagery ability  Main research (n=45)  Inclusion Criteria:  athletics specialize in projects with excessive hip range of motion, e.g. soccer, track and fields, hockey, etc. groin pain on dominant leg with tenderness on hip adductor symptoms lasting for 2 to 6 month and related to training or sports. The training maintained for at least 2.5 hrs/week.  Exclusion Criteria:  sign of hip-related groin pain (hip flexion <115°, hip internal rotation <15°) sign of other soft tissue related groin pain (tenderness on psoas, pubis, inguinal) surgery history on lumbar or lower extremities any symptoms on lumbar, knee, or ankle any neurological disease affects on motor imagery ability