Lajin (拉筋; pinyin: lā jīn): La, to stretch; Jin, tendons and ligaments. To put it simply, Lajin is to do a simple and effective exercise to stretch the tendons and ligaments that connect the skeleton and organs in the body. It helps to make the bones in places and tendons flexible, remove meridian blockages and enable smooth Qi and blood flow. Persistent practice heals various contraction-induced diseases, including the most obvious pains that affect the neck, shoulders, waist and legs.

While Lajin, compared with medication and acupuncture, is not widely practiced as a major therapy, various stretching exercises have long been existent in yoga, sports, Taoism, Kungfu (martial arts), Qi Gong, and Chinese medicine.