What kind of clients would I market to for training during daytime hours (7:30am – 4:00pm)?

I am a certified personal trainer and group fitness instructor. I understand that the nature of the fitness business is that the majority of clients are available early mornings or in the evenings. For some reasons beyond my control, those times can be particularly hard for me to work with. I am looking to train people during daytime hours, say 7:30am-4:00pm. What kind of clients would be available during those times and how could I market myself to them? Thanks!