舒筋 (shū jīn) is a Traditional Chinese Medicine (TCM) term literally meaning 'to relax the tendons' — where 舒 (shū) means 'to ease, soothe, or release tension', and 筋 (jīn) refers to tendons, ligaments, and related connective tissues (often extended in TCM to include muscles and fascia). It describes a therapeutic process aimed at relieving stiffness, improving circulation of Qi and blood, and restoring flexibility in the musculoskeletal system.

This term is commonly used in clinical TCM contexts — such as acupuncture, tuina massage, herbal therapy, or qigong — to describe treatments targeting chronic pain, post-injury recovery, or conditions like frozen shoulder or lower back strain. While it may appear in everyday speech (e.g., after exercise), its technical use implies a deliberate, therapeutic action rather than casual stretching. It is rarely used as a standalone noun; instead, it functions primarily as a verb phrase, often appearing in compound verbs like 舒筋活血 (shū jīn huó xuè, 'relax tendons and invigorate blood').