CFM (Call For Motion) and/or PNF (Proprioceptive Neuromuscular Facilitation)
In CFM, therapist pins or glides pressure over targeted area as client perform the movement instructions given by the therapist. Pin or Glide with Soft Fist or Soft Knuckles on Traps (near Scalenes attachment at rib) while client moves through lateral flexion for 2-3 reps on each side. *If the client can ’t move through full ROM, you may be pressing too deeply; clients will receive better results by reducing pressure so that maximum call for motion can be experienced.
Also consider adding advanced stretching interventions like PNF, which combines client’s gentle activation of the agonist muscle for three repetitions of 5 seconds on, and 10 seconds off (during the client’s lax 10-second phase, therapist may invite safe, deeper ROM as available).