K before i go into this, let me say that while i think this guy is one of the biggest kooks in skating, its definatly not because he goes to the gym and does other shit to help him skating.
Obviously lifting weights and improving your cardio wont help you directly to do a smith grind or whatever specific trick, but it will definatly help your ability to skate like 8hours a day. Doing cardio everyday will increase how long you can skate, and the more/longer you skate, the better you will be. While i dont see how arm workouts are good, i would definatly say there are some gym workouts that would help with the ability to absorb impacts and shit. Im sure theres a ton of muscles that skateboarding doesnt use that you could work out in a gym to help jump higher or take impacts better, or even just improving muscle distribution (if you skate regular too much or something). I can definatly say that it will help avoid injuries though. Skateboarding doesnt work out yuor upper body whatso ever, and I would bet money that your wrists/arms and shit take a much lesser beating if you work them out and shit. Look at johnny layton in the toymachine video extras when hes trying to front board that mega kinked rail that everyone skates over. He flies backwards everytime but never smashes his head like every other pro woulda done. Hes also beef as fuck, leading me to believe his upper body strength has assisted him in avoiding many head injuries. I actually have gained more respect for chaz for actually being so dedicated to skating that he takes time that normal pros would be using to smoke weed/get wasted/ do drugs, and devotes it to increasing his longjevity on a skateboard and reducing probability of injuries.
Whats next? you core faggots gonna start maknig fun of people for stretching before they skate?