> The issue with three sets is muscle soreness

I appreciate the fact that we all can't be athletes: having said that; there was a time in my life when I would open my eyes Every Morning to blinding pain from my workouts. But now, 30 years later, the benefit (I believe partly from having been in such awesome shape and I do still workout strenuously, but not to that level) is that even at 60 years of age I still have stunning reaction times, I can still do things most 35 year olds can not and my driving is still freaking crisp!

PS: I can still do over 60 consecutive pushups and planck for 4:30 minutes. Sure somedays I'm sore as hell but fuck that old age shit... ;)