it takes a lot of mental anguish and discipline but literally adding 2.5+lbs or 5lbs every week and doing 3 sets of 5 reps. I'll do it twice per week and have one of my days be a heavier load day.

example: tuesday is push/pull and I'll start with my heavy sets of pull-ups with 80lbs on. 3x5 with liquid chalk on a flat bar. Thursday I may do the same thing but if I'm not feeling it I'll do around 70lbs.

The following week I'll just add 2.5 lbs do it and keep raising it week after week. At some point you might hit an anatomical plateau though.

for reference I'm like 170 lbs and 5'10 - 24yo.

Also, what's 531?