What should you do if your opponent is too heavy for you to push away?

Combat is like a game of chess. In order to win you have to fight with advantages. If your opponent has advantages, you neutralize them. When you have advantages over your opponent, you exploit them. If you don’t have any advantages, you create them. If your opponent is too heavy for you to push away from the front, for example, you move to his side where he is weakest and push him away with little effort.