Ok Maryse, I read a book a while ago.
About a woman who finally leaves her husband/fiancé- she gave up everything to help him in his career, blah, blah, but she is a little over weight & he puts her down constantly.
Anyway, she takes up running to lose weight & becomes friends with a group of firefighters who run the same hill as her. She has a group of lady friends who meet at a park to watch the guys run. Romance ensues.