I am the quintessential hard-gainer. I have a condition called pectusexcavatum, where my sternum grew in reverse. This changed the shape of my heart from a fist to a pancake, meaning it beats really fast. I have ALWAYS had trouble gaining fat AND muscle.
I'm 29 years old. When I started this pro-hormone cycle I weighed 148 pounds. I now weigh 172. When I started I 10-repped 65 lbs on bench - now I rep 120 and my last max was 175. I've had similar strength gains for all muscle groups.
I've gone up a pant size and my frame looks much better. This stuff WORKS!