I think it's easy to forget just how massive the muscles in...

I think it's easy to forget just how massive the muscles in the legs are, and how much testosterone is released in your body when you make sure you work your legs hard. Some people's bodies just take a long time to grow, and if you're naturally thin there's no cheating. It takes time. Your body will only grow muscle at a certain rate for your genetics, so take your time and keep at it.