Figure 1. . Twenty-six digitized points were used in this study – 17 points according to the protocol of Ae (1996) and nine tennis-specific points. Their locations were as follows: top of the head (1), center point between the ears (2), episternum (3), most lateral acromion on the right (4) and left (5) sides, center of the right (6) and left (7) elbow joints, center of the right (8) and left (9) wrist joints, tips of the fingers on the right (10) and left (11) hands, most lateral aspect of the greater trochanter on the right (12) and left (13) sides, center of the right (14) and left (15) knee joints, center of the right (16) and left (17) ankle joints, most lateral point on the bottom of the right (18) and left (19) shoe, most medial point on the bottom of the right (20) and left (21) shoe, most frontal point on the bottom of the right (22) and left (23) shoe, most posterior point on the bottom of the right (24) and left (25) shoe, and most distal point on the tennis racket (26).