Objectives: The objectives of the present research were: (i) to analyse the dynamics of total distance and mean velocity in relation to the utilised tracking technology (Global Navigation Satellite System, GNSS; and Ultra-Wide Band, UWB) and (ii) to describe the physical demands performed during the small-sided games (SSG). Methods: Sixteen semi-professional national-level football players (Age: 23.6 ± 3.3 years; Body mass: 78.1 ± 5.2 kg; Height: 1.8 ± 0.1 m) performed 4 SSG with different aims: (a) maintain the ball; (b) maintain and progress; (c) maintain, progress and ending in mini-goals and (d) maintain, progress and ending in a goal with a goalkeeper. To data acquisition, a WIMU PROTM inertial device with dual tracking technology (GNSS and UWB) was used. Results: The main results were: (1) a nearly perfect correlation in the values obtained by both technologies (total distance: r2=.987; mean velocity: r2=.994) and (2) statistical differences between the 4 SSGs in total distance, relative distance, high intensity distance (>16 km/h), sprint distance (>21 km/h), mean velocity and High Metabolic Load Distance per min (p<0.01; F=34.33-4.57; d=2.13-0.80). No statistical differences were found in accelerations/min and decelerations/min (p=0.27-0.08; F=1.31-2.30; d=0.31-0.45). Conclusions: Both tracking technologies could be used to quantify the physical demands. In relation to the aim of small-sided games, this was determinant in the physical demands. Thus, the analysis of game-based tasks is very important to control their effects for a correct application during the training sessions.