Aim: This research is aimed at the comparison of the amount of weekly physical activity of professional soldiers of the Army of the Czech Republic (soldiers of the 7th mechanized brigade) during an ordinary week spent in the garrison and during a week of continuous field training. Methodology: The observed group was made up of 48 professional soldier volunteers in the age range of 30.12 ± 4.84 years. The measurement has been performed continuously during the time span of one week. Physical activity has been measured with the utilization of the ActiGraph GT1M accelerometers supplemented with the use of a weekly physical activity protocol. Results: Based on the results it is possible to infer that no difference has been found between the amount of weekly physical activity of the soldiers during a week spent in garrison and during a week of continuous field training in a military training area. The level of physical activity has been sufficient during both of the weeks. The average active energy expenditure has been 18.27 kcal higher during the week of continuous field training. The average active power has been 5.06 kcal/hour higher during the ordinary week spent in garrison. Conclusion: Based on the values of average daily step count during an ordinary week in the garrison and during a week of continuous field training the soldiers´ activity can be categorized as regular medium intensity movement without competitive sport activity (Máček et al., 2010) and meets the healthy recommended value of number of steps per day (Aoyagi & Shephard, 2009).