Alejandro Álvarez-Bustos (ORCID 0000-0002-3431-7204) holds a degree in Physiotherapy, a Master’s in Physical Activity and Health, and a PhD cum laude in Epidemiology and Public Health. He is currently a postdoctoral researcher at the Center for Biomedical Research Network on Frailty and Healthy Aging (CIBERFES), a research consortium funded by the Ministry of Science, Innovation, and Universities of the Government of Spain. His research interests include factors associated with frailty, sarcopenia, physical function and functional decline in older adults and the impact of various interventions, primarily physical exercise.