When I was really young (around 9 or 10) I could never get above 70 lbs (I know, terrible right?). Ever since then I've often thought of certain weights as barriers. They're points that I usually need momentum to get past. 180 lbs is the one I'm working on right now. It's the one I've spent the most time near. Whenever I approach it and don't have enough momentum to get past it, I usually bounce off it and start gaining weight again. This is usually due to me not continuing to work on losing weight once I get there.
Once I get past it (hopefully this week, should have been tomorrow or so but...) I'll be working towards the last one I will probably get past, 160. This was discovered after my time in boot camp, when I was last down there.