Prolonged sitting, lack of physical activity, and bad eating habits are the main factors of an unhealthy lifestyle. They cause growing health problems and are the reason for an ever-increasing amount of sick leave, which burdens both the employer and the entire health system. The consequences of an unhealthy lifestyle are also reflected in body composition. In this master's thesis, we wanted to find out how different interventions affect the body composition of employees. We included 120 subjects in the research, half men and half women, who were on average, 37 years old. Participants were equally divided into three different intervention groups: (1) intervention where the group was included in a kinesiology workshop, where they had individual training with a kinesiologist once a week; (2) an intervention where they were given Garmin smart bracelets that measured their physical activity and (3) an intervention that offered subsidies for various guided exercises. The research lasted three months. The following parameters were measured, before the start and after the end of the interventions, using the body composition analyser Tanita: body weight, fat mass, visceral fat level, and muscle mass. The measured data was statistically analyzed with the SPSS program. We defined the differences in measurements as statistically significant at a risk level of 5% (p = 0.05). Based on the obtained results, we concluded that the "kinesiological workshop" intervention was the most successful, as it caused the highest reduction in body mass, fat mass, and visceral fat level. In the "Garmin bracelet" intervention, there was also a significant decrease in body weight and fat mass. However, there were no differences in visceral fat and muscle mass. The least effective approach was the intervention that offered subsidised exercise from external providers. In this intervention there was not any improvement of the measured body composition parameters. In conclusion, based on the obtained results, the individual approach under the guidance of a kinesiologist is the most successful in increasing physical activity and therefore overall improvement in body composition.
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