I totally agree with Sophie, everyone is different. I also think it involves a lot of factors such as how lean you are prior to a building phase, genetics, how long you build, etc. ~ I recently did a building phase for 6 months and only gained 8 pounds. I was still able to fit into my jeans (comfortably, albeit a little snugger) and only had a small amount of fat in my lower back and legs. I could see a difference, but my family didn't even notice. I had to point it out that I had put on weight. Equally, I'm currently in my 11th week of a lean out phase and have managed to lose weight/fat without any problems. It's all individual.