There is no secret to Saitama's power. I'm tired of hearing and reading  people trying to figure out Saitama's powers or where he got 'em. Seriously, there's no "logical" reason to explain how he can one punch an enemy other than his 100 sit-ups, push-ups and squats and a 10km run. That's it! No magical fruit he ate, no monster cells, no supernatural secret behind. He just basically broke his limiter and I believe ONE will not change that nor will he give thorough explanation. This is OPM guys. Geez