Abstract prolong survival, improve exercises can prevent complications, Therapeutic :Background study theim of A for patients after open heart surgery, and decrease hospital stay. outcome was to evaluate the effect of therapeutic exercises program on patients' outcomes undergoing open heart surgeries. Subjects & Methods: Research design: A quasi experimental research design was used. Setting: The study was conducted in Cardiac Surgery department and Open Heart Surgeries Critical Care Unit of Cardio Thoracic Hospital at Zagazig University Hospitals. Subjects: Composed of sixty adult patients. Tools of data collection: four tools were used for data collection: 1st tool was a Patient assessment sheet. 2nd tool was an Observational checklist. 3rd tool was a Rating of Perceived Exertion Scales (RPE). 4th tool was a Patient questionnaire Cardiac Exercise Self Efficacy Instrument. Results: Revealed that the highest percentage of patients in the study and control groups were females, more than 40 years of age. There was a statistical significant difference in total post-operative exercise performance among subjects in the study group with (p value 0.001). After program implementation there were statistical significant differences between subjects in study group and those in control group regarding post-operative cardiac, pulmonary, renal parameters, homodynamic state, oxygenation, and investigations findings. There was a reduction in the time spend on mechanical ventilation, and lessen in the length of ICU stay for patients in the study group than that for patients in control group. Conclusion: The therapeutic exercises had statistically significant effect on improving the post-operative clinical parameters, homodynamic state, oxygenation, investigations findings, reduce the intubation time, and reduce the length of ICU stay of patients undergoing open heart surgeries. Recommendations: Therapeutic exercise programs should be held periodically for such group of patients to improve their outcomes.