To investigate the feasibility of a home-based exercise training program using a smartphone application in patients planning for cancer surgery, and to determine the effectiveness of this application on functional capacity.

Inclusion Criteria:

• Adult patients (19-70) who are scheduled for elective cancer surgery
• American Society of Anesthesiologists (ASA) physical status classification I or II
• Patients who can use a smartphone application
• Patients who can perform an exercise program for at least 3 weeks from the first visit to the preoperative clinic to elective surgery

Exclusion Criteria:

• Patients who are unable to communicate
• Patients under the age of 19 and over 70
• Patients who have a major medical or psychiatric disorder that is expected to affect exercise
• Patients with contraindications to the general rehabilitation program

Patients who visits preoperative evaluation clinic for preoperative counseling before the cancer surgery