Maingaining - Lean Bulking – Bulking – Cutting Maingaining: Keeping the same body fat percentage throughout a period of time and increasing muscle mass. 2700 calories a month needed in a month to add 1 pound (0.45) of muscle. = 90 calories a day. Healthy body fat % to keep and maingain for general public is around 15% to be healthy, recover fast, don’t mess up your hormones. And you will look decent. Some individuals with blessed genetics can get away with lower BF% all year long.