For Your client You may also use “Corrective flexibility”. It uses the principles of autogenic inhibition. It includes self-myofascial release (foam roll) techniques and static stretching.
Self-myofascial release applies gentle pressure on muscle for 20-30 seconds. The force applied stimulates the Golgi tendon organ and creates autogenic inhibition, decreasing muscle spindle excitation.
Static stretching passively takes a muscle to the point of tension and holds it there for 20 seconds, creating autogenic inhibition. Also,contracting the antagonistic muscle during stretch inhibit the muscle being stretched and increasing muscle’s ability to lengthen.