This is what I've heard, at least. What are the benefits? How does this function anyway? I feel like the basic foundation of my body is pretty masculine and that i've just never taken advantage of it because I never got into intensive working out. I'm a 20 year old guy but I've always looks younger than I am, or so I'm told. I never really got into sports or fitness and recently I've decided that I'd like to. I've been told many times that I have a very great build to start with (something believable since I still managed to be checked out a lot at the beach without working out/having a "beach body") and that I would look great if I worked out due to it..so I've decided I will start. I am natually leaner than most but since I am fairly inactive, I still have some fat of course. If I get rid of this, will I get a more defined jawline? Why does it seem that gymrats always have a defined jawline? Any answers help.