Background: cardiac pre-training Prehab improves cardiac patients' physical fitness and considerably lowers their mortality rates. Little is known about the use of exercise therapy before coronary artery bypass graft (CABG) surgery in order to improve patients' physical fitness preoperatively. This study aimed to assess the effect of prehabilitation on patient's undergoing coronary artery bypass graft outcomes. Research design: Aquasi-experimental research approach was employed. Subject: sixty adult patients divided into 2 groups 30 patients in each having coronary artery bypass graft, one as study group, and the other as control group. Patient's age was between 18 and 65 years old. Setting: At cardiothoracic surgery department at Assiut University Heart Hospital. Three following tools were utilized for data collection: Patient's assessment sheet (Demographic patient data, Patient's medical data, General health assessment sheet), Assessment of physical activity and functional capacity for patient (Six minute walking test, Borg Rating of Perceived Exertion (RPE)), Construction Prehabilitation Nursing Booklet. Result: there was statistical significance difference between study and control groups as regarding general health regarding Physical function, pain, Physical performance and validity, highly statistical significance difference was found between study and control groups as regarding 6minuts walk test, statistical significance perceived regarding exertion scale. Conclusion: Post prehabilitation patient outcome improves regarding decrease hospital stay &early recovery than prehabilitation implementation. Recommendations: Prehabilitation application for all patients undergoing coronary artery bypass graft should be given in the form of video to be more effective.