This cluster of papers covers a wide range of topics related to social activity and health research, including the impact of socioeconomic factors on risky behaviors among adolescents, the role of redox homeostasis in cancer, the use of ethnography in health research, and the development of mass sports as a basis for a healthy lifestyle. It also explores the influence of beliefs and motivation on socio-psychological adaptation among university students, as well as the relationship between digital learning environments and the science of learning.