Oh no, I'm not that worried about gaining some weight. I still have some fat I could burn off and all that. I just don't want look like a hulking bodybuilder. I'm only about 5'6 tall, so I don't think that would look good at all. I also want to fight later on so I want to have more of a "fighter's" physique and strength while keeping my current size. 5 pounds or so is alright for me. With the fat I lose and that small amount of muscle I gain I should probably stay at around 70kg/155lbs which is what I want.
I, of course, also want to remain pretty flexible. I do yoga once a week.
I drink a low carb protein shake after or before every session. How will this effect my size?