Best model diet n exercise routine?

i want to be a model as a side job during college and im serious about it. everyone says that im really pretty n im a natural at posing for the camera. so i have no problem with that. I've done a lot of photo shoots already but the thing is, the photographers n designers say tht i should keep in mind about my body. like i need to work on getting it slimmer. i would appreciate it if u girls who have worked as a model before tell me sum of the tips n routines to get the perfect body:) dnt worry im not a freak i care about my body so i wont go over board n be anorexic.