sporty girl in sports wear poses in starting position in studio with white background

abdomen adult arm athlete athletic athletics background belly black blond briefs clothing competition fitness fun girl ground gym hair hairstyle happy isolated jogger jogging joy lies limb longhair lying marathon muscle neck pink ponytail poses posing position pretty runner running schoolgirl shoes slim smiling sport sports sportsbra sportstop sportswear sporty sprint start starting studio teen teenage teenager thigh top training undefined wear white youth