Firstly: He doesn't neglect his legs like many other bodybuilders. His legs have amazing muscle mass. Thus his whole body has wonderful proportions. And secondly: He obviously has fun in his gym, and he shows his joy. He enjoys to work out and to show off his growing muscles.
See the first two videos with "Sixpack" and his hard workout in gym with very heavy weights.
Best Workout:
RealWorkoutsInc
Repetrope
RealWorkoutsInc
Repetrope