I’m not commenting on his fitness per se. Some people are just animals. They have “that dog in them”. They go to the gym and they push past their limits, intentionally, subconsciously really, almost like they’re punishing themselves. Others go and do a prescribed work out at the prescribed weight and intensity (and this is not saying it’s an “easy workout” - it’s designed by a team trainer to be appropriately challenging and sport specific) but that’s what they do. What’s prescribed. Rantanen looks like someone who cuts his rest sets short, wants to throw an extra 20lbs on the bar, wants to do “one more set” and then “one more set”. Kakko seems like someone who does the workout that has been outlined for him. He isn’t fighting demons or pushing himself past his mortal limits. That manifests in moments on the ice as well, when it’s time to dig deep and push beyond your normal level. I guess it’s a long winded way of saying “having an extra gear”. But in my experience through competitive hockey, through the military, etc. a lot of that “having an extra gear” is something that is forged in the gym and how hard you’re willing to push yourself. Do you make yourself nauseas going to maximum exertion? Do you do drop sets until 10lb dumbbells have your arms shaking? You can still get just as massive or lean and ripped and muscular by not doing that. But you won’t develop that mental fortitude and extra gear without pushing yourself. 100% opinion, of course.