mmmm…. Interesting that the runners seem to be the same people that are at odds with the general tenor of the posters here (pashute yid, illin07,etc) And, even more interesting, I(another of those pesky outsiders) too have been a runner for man, many years. I recently stopped running and only walk because of my knees (Pashute yid, I do not think it improves your knees).
In my heyday- I used to run 4-5 miles every other day. Often in the streets, more recently on a track. I loved it. It makes yo ufeel great ,improves your stamina and you really enjoy the shower afterwards!
I used to fun in the evening (I am not a morning person)but I hated doing it in the winter,too cold.
All of you youngsters- go for it and you will enjoy it! That includes “bais yaakov girls”. Why can’t you run too? if you are very frum ,just wear a very loose sskirt…