The first one struck me the most, it is quite edgy I think. I also like the aesthetic with the course (could almost say anti establishment blurring) and the naughty "In the gym locker" feel about it. This image over the others has more context behind it.
Thanks for the comments. She is a bit on the thin side tbh. I enjoyed the shoot apart from having to direct the whole thing as she couldn't pose but I came away with some good images