[url]http://connect.hbo.com/events/hbo-boxing/5-questions-gennady-golovkin/[/url] Here comes featherfisted dealt with to talk some psuedoscience.
Power comes from the mind. Takes years of practise punching through your target. Same as golf. You dont go swing the club as hard as you can with force, you follow through with technique. Lower body work with weights can make you more explosive but thats different than power
it does come from the mind. Punchers have no let up. people that pull their punches are timid of whats on the other end, injury or being countered
Yes, how your muscles developed from birth on etc. A combination of all these things really. But there's no doubt increasing mass in your biceps, triceps and shoulders can add a little to your power. I mean, you're adding mass/weight to the implements that you're hitting your opponent with. Obviously it's going to increase the damage you can do. The extent of which it can increase it though, is debatable.
It's a combination of all of the above. Just look how relaxed GGG is and how he slides across the ring with his feet planted 99% of the time. His mental and physical makeup is A+ he's a happy-go-lucky assassin with an iron chin and multi talented. Pressure's while he counter punches. He doesn't waste energy neither. High ring IQ. His vaunted power is only ONE part of him fighters need to worry about. His confidence, technique, and physical strength allows him to do what he does.
again, depends on the fighter if power was a 100% trainable trait, and wasn't at the expense of other attributes, then boxing could challenge WWE for popcorn value
I think important factor is also character. Look at Tyson, Hearns and prime Pac, they wanted badly to KTFO their opponents, they were mean...