LST (low-stress training) is a cannabis plant training technique where the branches on the plant are gently bent and tied down as they grow. This will keep your plant short as allow multiple branches to grow up creating multiple bud sites.
Mr.C Growin4B is a cannabis grower who has a very small space to grow. Therefore, he does LST on his cannabis plants. In the video below, he performs LST on multiple marijuana plants - Sour Diesel strain. He uses 3 fingers pinching together and also squeezes his fingers together to make the branches flexible.
Check out his video here: