Thousand Pound Pendulum is a technique that seemingly increases one's weight/force through breathing. It has several different applications.
Go Gamdo's Style[]
Go Gamdo used this technique to disrupt the opponent's centre of gravity by pulling the opponent with significant force while using this technique.[1]
Gang Daehyeop's Style[]
Gang Daehyeop used this technique to vent his frustration of not being able to participate in the G.O.H. Tournament, shaking the whole office building he was in.[2]
Southern Style[]
An unnamed Priest used this technique to increase the power of his stomp, though its full effect isn't seen as Han Dae-Wi countered and completely obliterated his foot.[3]