I want to know the answer to the following question:
What did John build up?
All the background I'm provided with is that "John grew up to be around 5 ft 5 in (1.68 m) tall, relatively short, with a "powerful, barrel-chested body" and dark red hair; he looked to contemporaries like an inhabitant of Poitou.". Is that enough to answer the question?
Answer: no