Hi, this is my first post on these forums. I'm 15 years old, (almost 16) I'm around 5'8'' and 115lbs. I've never really been a strong person, or a tall person for that matter. However or the past few years I've really been growing, and still am. I am hoping to reach 6' in height. I also really want to excercise, but I heard that if I weight train (I use the Total Gym Elite if that matters) and build muscle mass, it will take away from my growth. This worries me, because I hopefully still have 2 yrs of growth left in me to reach my goal, but I also want to stay fit and gain some mass as I'm underweight. I don't want to compromise my height to put on muscle, but I also want to work on building muscle mass as soon as I can. Is this rumour true? Thanks in advance!