The assumption of the research is to assess the change in body posture depending on the given level of physical activity in young people. The aim of the study is to assess body posture in young healthy people depending on their level of physical activity. The research will allow the analysis of the correlation between the level of energy expenditure and the occurrence of changes in body posture. The obtained results will allow the development of diagnostic and therapeutic programs for the prevention of overload changes in the spine in young people.

The study will be conducted in a group of 200 people aged 19-25. Posture assessment will concern the measurement of curvatures in the sagittal plane of the spine using a gravitational Rippstein plurimeter and performing a three-dimensional analysis of the spine using the DIERS 3D device. In addition, a modified Matthias test will be performed using the DIERS 3D device, where kyphosis and lordosis parameters in the sagittal plane of the spine at isometric tension of the spinal muscles will be assessed. The spinal motion in the sagittal and frontal planes will also be measured using a digital inclinometer. In the second stage of the study, the participants will participate in the activity in the form of endurance training "Nordic Walking" (NW) for a period of 8 weeks 3 times a week. The recording of energy expenditure during a normal day of activity will be done using an Actigraph GT3X accelerometer. After a period of 8 weeks, all measurements will be repeated.

Inclusion Criteria:

• age from 19 to 25 years old
• good health enabling the exercise of various forms of physical effort -cardiologically stable persons, without significant respiratory, nervous and musculoskeletal disorders / no other diseases
• written consent of the examined person

Exclusion Criteria:

• age below 19 and above 25,
• health condition preventing the exercise of various forms of physical effort (cardiologically unstable persons with significant respiratory, nervous and musculoskeletal disorders / other diseases that prevent physical activity,
• lack of written consent of the examined person,
• lack of cooperation of the examined person during the test

Students of Medical University of Silesia in Katowice, Poland