Also got this

(copied and pasted)

Roy did no upper body weights (until training for Ruiz) and says his physique was developed through hitting the heavy bag, push ups and pull ups. He did leg weights (after running) because he had bad knees but always low weight for high reps.

He says if he didn't play basketball he wouldn't be able to stay at the top in boxing, because he wasn't the best at basketball and needed that hungry attitude to carry over into boxing training.

And yes, I agree, Roy trained like a machine.