OK, I want to put on lean muscle mass, with very little fat gain, if none at all. My routine is WBB1 with some HIIT thrown in at the weekend. I've been tracking on fitday, and have stayed at a consistent weight for the last 5 days, eating about 3500kcal(obviously my weight flucutates at the end of the day slightly depending on how much water I consume). What would you recommend I eat, SPECIFICALLY with these thing in mind? Any ideas would be great!