The Exercise for COlorectal OLder patients (ECOOL program) is randomized controlled trial to assess the effects of an exercise program on physical function and health-related quality of life of patients 75 years and older with colorectal cancer undergoing surgery. ECOOL is a multicomponent home-based exercise intervention focused on the development of strength, balance, gait ability and inspiratory muscle function of older patients who receive weekly telephone follow-up from cancer diagnosis to 3 months after surgery. The investigators expect that ECOOL program will improve physical function and health-related quality of life of older patients 3 months after surgery and to maintain these benefits up to 6 months after surgery compared with the control group receiving usual care.