Relationship Between the Risk of Falls and Frailty, and the Effect of a Physical Exercise Program on These Conditions in the Elderly: a Randomized Crossover Clinical Trial.

The goal of this randomized crossover clinical trial is to examine the effectiveness of a new therapeutic exercise program in elderly patients with risk of falls and physical fragility. The main questions it aims to answer are: * If the therapeutic exercise program proposed is a successful treatment for this kind of patients * If patients at risk of falls also suffer from pre-frailty or frailty, and if they can be treated together with the proposed therapy. Participants will follow a program consisting of exercises to correct posture, gain strength and contribute to greater balance. Researchers will compare the therapy and control groups to see if the program increases the percentage of muscle mass of participants, their mobility, balance, quality of life and if they reduce their Fried´s frailty criteria, fear of falling and falls compared to their usual physical activity.