The goal of this clinical trial is to learn if a nature-based intervention program has positive effects on the physical and psychosocial health in a group of older participants with chronic non-specific lower back pain. The main questions it aims to answer are: Will the program improve: * The physical outcomes such as mobility, strength and balance? * The psychosocial health outcomes? Participants will: * Be assessed before and after the program; * Participate in one session per week of the intervention.