"A convincing example for this is the Bad Harzburg Compact Cure "Degenerative spine sicknesses and chronic dorsopathy". It requires three weeks of intensive work at the movement apparatus by the parient. Because doctors have recognized in the meantime: The best medicine for back problems, which is after all Germany's top ranking public sickness, is a purposefully trained body. In former days, mostly heat and radiation were the treatment for spine pains and stiff shoulders. In Bad Harzburg, patients are also treated with pain relieving frost."

Here is a Google hit that supports your translation of Trainingstherapie as "exercise therapy":

"... found strong evidence that exercise therapy was equally as effective as ... patients with
uncomplicated low back disorders, but are less effective ..."