Resumen: Sustainability and population have a complex relationship. Popular versions of the first are usually based on the premise of reducing the population. However, in some remote rural areas with a low density, this condition needs to be reconsidered, as it would put the viability of the local community at risk and lead to environmental, economic and, above all, social losses. Although repopulation is impossible, since remote rural areas have an ageing demographic structure and an extremely low fertility rate, we can propose the regeneration of their human, social and relational capital by attracting talent and commitment. To achieve this, the Desafio Programme (Rural Erasmus) enables university students to do internships in companies and institutions in sparsely populated areas, living alongside their residents. Despite being an experimental policy with a narrow scope in statistical terms, the Desafio Programme is an inspiring experience supported by those who have participated in it and contributes to the social and economic regeneration of areas in decline. This is a practical case of applying a sustainable strategy to a rural area in crisis, which can be transferred to many other countries facing a similar problem. Idioma: Inglés DOI: 10.3390/su12124926 Año: 2020 Publicado en: Sustainability (Switzerland) 12, 12 (2020), 4926 [25 pp] ISSN: 2071-1050 Originalmente disponible en: Texto completo de la revista