[EN] Understanding the physical impact of ancient labours has become an important experimental bioarchaeology area. Complex motion capture systems and digital tools have been used in biomechanical analysis during the reproduction of manual tasks. However, these systems are costly, so the researchers have explored alternative digital solutions. Therefore, the open-access Kinovea software was checked to confirm its reliability in characterizing the physical loads associated with particular works of ancient times. In this case study, the authors have analyzed the central postural angles and muscle chains involved in the indigenous manufacturing process of rotary stone mills, in the high mountains of Tenerife. The study included a virtual motion capture analysis carried out during the different phases of the experimental reproduction of this process; it was defined from the archaeological record of the quarries-workshops of Las Cañadas del Teide National Park (Canary Islands, Spain) volcanic millstones. The results of this study have demonstrated the software's effectiveness to virtually analyze the significant differences in posture between work techniques, observing a predominance of the use of m. biceps brachii, the m. brachioradialis, and the elbow joint during the manufacture of stone mills. On the other hand, Kinovea also has excellent potential in virtual archaeology, giving users tools to generate the average postural angles. As a result, building "virtual skeletons" in more precise work postures has been possible. This may serve as the base element to create complete body representations in virtual environments. Highlights: The combination of biomechanical analysis and open-access Kinovea software enables the study of musculoskeletal and articular wear of experimentally reproduced tasks. The repeated use of the right arm during indirect percussion and abrasion in lithic production could increase the changes in bone robusticity of specific muscle attachments observed in the osteoarchaeological record. Motion ranges and postural angles analysis can generate more accurate representations of "virtual humans" in their archaeological context., [ES] La comprensión del impacto físico de las labores del pasado se ha convertido en una importante área de la arqueología experimental. En el análisis biomecánico de la reproducción de tareas manuales se han venido utilizando frecuentemente complejos sistemas de captura de movimiento y marcadores reflectantes. Sin embargo, estos sistemas son muy caros, así que hemos explorado soluciones digitales alternativas. De esta forma, hemos querido comprobar la fiabilidad del software de open-access Kinovea en la caracterización de las cargas físicas asociadas con ciertos trabajos del pasado. En este caso de estudio, hemos analizado los principales ángulos posturales y las cadenas musculares involucradas en la manufactura indígena de los bloques de molino rotatorio en la alta montaña de Tenerife. Para ello, se ha llevado a cabo un análisis virtual de captura de movimiento durante las distintas fases de la reproducción experimental de este proceso, definido a partir del registro arqueológico de las canteras-taller de piedra de molino volcánica, halladas en el Parque Nacional de Las Cañadas del Teide (Islas Canarias, España). Los resultados de este estudio han demostrado la eficacia del software para analizar virtualmente las diferencias significativas de postura entre técnicas de trabajo, observándose un predominio del uso del m. bíceps brachii, el m. brachioradialis, y la articulación del codo durante la fabricación de molinos de piedra. Por otro lado, Kinovea también tiene un gran potencial en el campo de la arqueología virtual, ya que se han podido generar los ángulos posturales promedios. A partir de estos, se ha podido constituir unos esqueletos virtuales en unas posturas de trabajo más precisas, los cuales podrán servir como elemento base para constituir representaciones corporales completas en entornos virtuales., The research submitted in this article has been made possible thanks to a funding PhD grant from the Spanish Ministry of University ("Formación de Personal Universitario/FPU") and funding from Fundación La Caixa project "Study and conservation of archaeological remains in the context of the Guanche millstones' quarries-workshops in Las Cañadas del Teide. A proposal of environmental and heritage sustainability". Additional funds were provided by the Dirección General de Patrimonio Cultural – Gobierno de Canarias. Also, we would like to thank the archaeological company PRORED Soc. Coop. for managing the archaeological interventions and supporting the experimental works. The virtual reconstruction of the structure in Figure 17 has been performed by PRORED Soc Coop, while the VS was created by the corresponding author