Dorsal pain caused by spine dysfunctions belongs to most frequent chronic illnesses in humans. Correct spine stabilisation is of immense importance for physiological body posture. The muscles of the deep stabilising spine system (DSSS) work as a single functional unit, where a dysfunction of only one muscle, causes dysfunction of the whole system. Non-invasive measurements of the condition of DSSS have been made possible by the construction of muscular dynamometer (MD) that is constantly being improved and its third version is currently available. The aim of our work has been the assessment of DSSS by diaphragm test and MD measurements. Based on an initial examination, a six-week intervention program is established including education on physiological body posture and correct basic body stabilisation for the given exercises and muscle strengthening. Consecutive measurements are then compared with the initial ones using pair t-test and the statistical program SIGMA STAT 3.1. Values with p < 0.05 are considered statistically significant. The initial measurements function also as control values. It was presumed that a smaller number of the tested subjects would be able to correctly activate the DSSS muscles before the intervention program as compared to after. A statistically significant change (p < 0.001) could be shown between the initial and final measurements of the six-week intervention program (for 46 adolescents aged 12-16). A positive change has been found for 87% of the proband. It is clear that if a person actively approaches the program, then positive adaptation changes on the DSSS are seen after only six weeks. With the muscular dynamometer changes in diaphragm activation, increase of intra-abdominal pressure and condition of frontal spine stabilisation are recorded. The changes between the initial condition of a subject and states after some exercise or rehabilitation are especially noticeable. Also, the effect of given therapy or correct performance of the exercise can be followed and observed.