Stationary summer recreation camps provide opportunities for comprehensive health improvement and optimal physical development of children and adolescents. However, the issue of evaluating the effectiveness of health measures during a single session (typically lasting 21 days) remains relevant. The paper is focused on the analysis of to modern approaches to physiological and hygienic assessment of the effectiveness of recreation and health improvement in children and adolescents in summer recreation camps, considering the short duration and complex nature of the health interventions. Additionally, it explores prospects for using modern biomedical technologies to enhance the reliability and information value of methods for assessing health-improving effects. Promising methods include those based on bioelectrical impedance and the use of digital health monitoring systems, considering the child’s baseline health status and individual characteristics.