I just started boxing 2 days ago at a local gym downtown. I had taken a cycle back in september. My trainers said I defintitely had good size to me and they were going to knock it down some and make me leaner. I told them I was planning on adding some more size and they said no, that the muscle would slow me down. I am 5'8 at 174lbs and was planning on taking another cycle around mid jan. Does he know what he is talking about the muscle slowing me down or what???