Passive stretching combined with use of a vapocoolant spray.
Pressure causes hypoxia and reactive hyperemia that clears the trigger point.
Effective, but painful. Myofascial release uses ischemic compression combined with passive stretching of the muscles during the compression. Also effective, but painful. Puncture, either by dry needling, or by injection of saline, or with local anesthetic. Local anesthetics require the least precise placement but cause muscle necrosis.