Why Stretching Before A Run ?

Jen Selter is known as a fitness fanatic. In this picture, you can see her stretching, as if she prepares for a run. She is dressed in a sports bra with white and dark blue patterns and navy leggings. The sneakers she wears are in contrast with her outfit, as they are white and have lime green laces.
Though, the outfit complements her body, as you can admire her wonderful shapes that she gained through hard working. She wears her hair flowing on her back, so that it complements the amazing look she has. The picture is taken in a park or something like that, as you can see trees in the background. This brings you to the idea that she prepares for a run. But a pic is always welcome, so here is the result!