For me, it's just a never-ending quest for more. I've always had really low bf%, so that's never been an issue. When I was in my teens, I was about 150lbs, and I decided to start lifting. I looked at myself in the mirror and thought I needed another 50lbs. I worked out hard, but knew nothing about proper diet. It took me over 10 years to put on that 50lbs, and I looked at myself in the mirror and thought I needed another 50lbs. I continued lifting, but unfortunately it was only in the last 5 years that I've realized how important diet is. Lots of semi-wasted years of training without the proper fuel to grow. Now I'm around 250lbs, and I look at myself in the mirror and think I need another 50lbs. The truth is there will probably never be an end to this journey, it has long since become a way of life for me.