Training? I don't think training exist, for references in Girls section there is Lesson mode where you can have 3 girls in Lesson which you can level up your girl & collect upgrade materials (which is to upgrade your swimsuit) however any girl in Lesson can't be played as until its over (or use certain items to make time go fast which I use if a girl in Lesson has a trendy outfit that I need in Festival), and Owner's Room has event called Jobs which collects furniture coins & levels up girls relation (for example Kasumi & Marie), this mode has a potential to get more FP Drinks if you got a trendy outfit for that character.