The physiological challenge of major surgery has been likened to running a marathon. In both cases, preparation is critical. Yet, many patients undergo major surgery without understanding the potential consequences. The STTARRS trial aims to test the effect of an education program delivered via telehealth in people preparing for lung or major abdominal cancer surgery , compared with usual care on the development of a respiratory complications after surgery. The secondary aims will be to determine the effect of the online education program for people preparing for lung or major abdominal cancer surgery compared to usual care on the following outcomes; acute hospital length of stay, surgical recovery, physical function and activity, self-efficacy, behaviour change, symptoms, health-related quality of life, number of days alive and out of hospital and health service usage and survival. This trial includes one sub-study. The sub-study will recruit eligible people preparing for lung cancer surgery. In the sub-study, 35 participants will receive an individualised inspiratory muscle training and walking program delivered and monitored by telehealth in addition to the main STTARRS trial intervention before surgery.