smiling teenage girl in sports wear laces up her running shoes in studio with white background

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