Ok, When Gixser said most people here are mall ninja's he was refering "wanna be ninja's" Also you could have all the trainning in the world in Wrestling, MMA, Muay Thai choose your art. There comes a point when size outweights skill never let anyone tell you different. I take martial arts and any martial artist would know look for an advantage. Your adavantage VS. The Big Show or anyone Half of his size is speed and agility, You guessed it running away. Also even kicking him he has such great mass.
Use Newton's Third Law: Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object. So your 600lb kick to a guy that is 500lb+ will to him feel like 100lbs of force. Also you feel as if your foot just hit a 500lb brick, because also stated in Newton's Law. You can only feel the forces being exerted on you, not the forces you exert on something else. So, it is the force his body is exerting on you that you see and feel in your hand.
Hope this helps all you.