Sometimes genetics just prevent guys from getting big calves. . . Unless you're a bodybuilder, and train them hardcore, it's hard to overcome genetics. . . . Despite all the running, and skippig rope boxers do, it's still hard to "build" muscle when you're burning that many calories, and restricting your caloric intake to make weight. . . . Also, when you train a muscle group every day (with little rest in between), it's hard to build mass. . . Finally, your body burns muscle before fat, and their genetic code tells their body to "burn calf muscles" first. . . You are 100% right about Pac and his tree-trunk calves, though. . . That's how he has kept his power. . . Proper punching technique requires your body to work together, and your power starts from your legs, through your core, through your shoulder, and EXPLODES OUT THROUGH YOUR FIST!!