Great genetics and learning excellent technique and throwing a million punches in the gym over the course of his life all with great technique
90% Innate genetic gifts 10% hardwork & technique Its scary to think he had bad eyesight his whole career, JJ is the hardest ever puncher imo.
wicked power, wow. unbelievable. his torso whips first, then arm follows. got to be combo of born, training, and perfect timing.
born. Valero was born too, I think. It doesn't matter how strong you are or how well placed your punches are - one in a billion born power.