Over time. I've really old training diaries showing it.Have you always been this strong or is this something that you've developed over time?
By way of example I'd been training a good few years and finally managed to do a standing press of 100lbs x 8 reps on a fixed weight barbell. A nice number to aim for. Now that's a warm up. Literally my first set with weight on the bar is 132lbs/60kg. My all time best is (I think) 132.5kg/269lbs for 1. On bench I'd been training maybe 12 months and did 90kg/198lbs which IS good for age 16 and a year working out.
Also, kinda obvious, why train if I'd always been that strong? lol