The SYDACK system of diagnosis and control in kinesitherapy has been developed. It consists of Avatar exercises -a virtual instructor, two sensors for monitoring a subject's shoulder and hip movement and computer software which combines the information from sensors placed on the subject's body with the computer. There are two ways to access the data: (1) graphically, as feedback information about the deviation of movement between the subject and the Avatar dispatched to the subject in real time and (2) via numerical data about subject's postural status and kinesitherapy process, expressed in angles, stored in a database for future processing and analysis.