Effects of a multicomponent training based on the VIVIFRAIL program on functional performance and cognitive function in acutely hospitalized older people

The goal of this clinical trial is to determine whether a multicomponent physical exercise program improves functional and cognitive capacity in hospitalized older adults compared to the usual hospital care. The main questions it aims to answer are: * Does a multicomponent physical exercise program improve functional and cognitive capacity? * Is there a difference between a multicomponent physical exercise program and usual care regarding functional and cognitive outcomes after an acute hospitalization? Researchers will compare a multicomponent physical exercise program (containing strength, balance, and walking exercises) to the usual care of the hospital to see if the program is better at maintaining or enhancing functional and cognitive outcomes Participants will: * Participate in multicomponent physical exercise program or receive usual care. The multicomponent group will complete the program daily for the entire hospitalization period; * Perform functional and cognitive tests at the beginning and end of hospitalization; * Be contacted by researchers 3, 6, and 12 months after hospital discharge.