Inclusion Criteria:  Patients receiving elective laparoscopic colorectal surgery. 18≤age≤100 years old, no gender limit; The ASA score is between I and Ⅲ; Clearly understand and voluntarily participate in the study, and sign an informed consent form.  Exclusion Criteria:  Emergency surgery; Those with a history of cognitive dysfunction; Those with a history of neuromuscular diseases,; American Society of Anesthesiologists class ⩾IV; Those with a history of spontaneous pneumothorax, coagulation dysfunction, Acute and systemic infectious diseases, moderate or higher fever; Pregnant women; History of drug abuse; Those who judged by the physician in charge to be unsuitable for ERAS-exercise; Other severe cardio-pulmonary diseases that would affect the 6MWD Those failure to obtain informed consent.