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Background: the relevance of the training process for students of various ages using mobile devices has determined the research concept. Aim of the study: to identify and justify the use of fitness trackers to increase the stamina of people older than 50 years in running, mixed mobility and nordic walking. The participants of the present study middle-aged, elderly and senile people over 50 years old (n = 48). The respondents of the experimental group in an independent training process for the development of endurance used a mobile device a fitness tracker connected to a smartphone. Using the gadget, the average athlete’s heart rate was analyzed during aerobic exercise at a distance, and the optimal movement mode was set on the tracker. It controls the athlete’s pace while overcoming the distance. Mathematical-statistical data processing was performed using Chi-square (X2) at p<0.05. A statistical study of the results obtained over 6 months proved the effectiveness of using mobile devices when running and Nordic walking compared to overcoming the distance in the training process without using them. The revealed results reliably differ (p<0.05) between focus groups in increasing the effectiveness of the distance running by athletes in terms of fulfilling the standards of the Ready for Labor and Defense sports complex. The use of mobile technology is more appropriate to use under the guidance of a coach and mainly for middle-aged athletes. Implementation of middle-aged, elderly and senile people cardiovascular system monitoring using mobile devices eliminates cases of overwork and injuries involved in active physical exercises. Keywords—fitness tracker; endurance; running; nordic walking; middle-aged and elderly people

The Use of Fitness Trackers to Increase the Endurance Indicator for People Over 50