Those guys train for that specific combine test. Most gym rats rarely if ever throw 225 on the bar and just rep out. These kids though train for this specificlly just to get a good result at the combine. I'm sure if you trained for it, you could do the same. The combine guys should really up the weight though, maybe 255-265 for reps. ThosE guys pumping out 35-40 reps at 225, would be a lot less IMO.