Trude, The movements on the somatics site, and those used in teaching Hanna Somatic Education are not in any way unique. They are basic natural human movemnts, when people habituate to say hunching over a desk muscles habituate to that posture, tighten and then move vertbrae and impinge on nerves etc etc etc.
The movements given by your physio can be "exercises" to make you stronger by pulling harder, further for more repetitions or in a somatic manner which is education "an experience"
"if you know what you are doing you can do what you want" - moshe feldenkrais
so do movements slowly noticing tightness, jerkiness of movement.
Lie on the floor, a firm surface and notice are your shoulder blades touching the same amount, what about your pelvis, thighs, calves, feet etc etc etc
often you are given strethening exercise but , if one side is tight it is due to one thing.
Muscles are just contractile units. They contract varying amounts, and unless paralised have some level of tone at all times.
What controls the muscles - the brain. If you severed the spinal cord which links muscle and organs to the brain what happens?
so involve the brain, anything you do can be somatic, sitting, walking, running etc etc
One thing that strikes me is the way many runners just run without sensing,
"Why am i making so much noise when my foot strikes? [if they were barefoot, they could run fast but not pound as the modern footwear softens this force, but the body still receives the forces]
just become aware of your self, do the movements slowly.
try getting into the semi supine position at least once a day see the attached link for information.
you could consider some for of somatic training, to get rid of the cause!!!! i.e. alexander lessons, somatic education, feldenkrais etc
another thing to try is stand or sit upright (not leaning back in a chair) check your range of movement by turning the head left and right. Do this very very slowly and stop when you feel the tension increasing!!!! now place your left hand on your right trapezius (on your shoulder next to your neck) and with your eyes shut turn your head left slowly. open your eyes has your Range of movement increased? do the same with the other hand/shoulder/head direction.