When i was around 15, i started working landscaping for a guy. My first day he also had hired a body builder. This guy would actually take protien breaks and scarf down tuna like he was taking smoke breaks. Anyways, me and my buddy who was a year younger than me worked circles around this guy. He was simply gassing out. When it came time to carry the large stones for the steps of the walkway we were building, he couldn't even do that. Now it could if been because this particular guy was a useless slug, or because he had dedicated his life to that point to building a ton of fast twitch muscle, but he was completely worthless even to a 15 year old. Even me now, 15 years his senior with a beer gut, would mop the floor with him in a work setting. Hopefully it goes better for you Sean, make sure he stays hydrated, that much muscle sucks water like crazy.