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For stable coronary artery disease, initial aerobic programming should emphasize moderate intensities that are below the ischemic threshold identified on recent testing. Heart rate reserve (HRR) is preferred for precision because it integrates resting heart rate and aligns well with oxygen uptake reserve. Prescribing 60–75% HRR in interval formats of 3–5 minutes with equal recovery supports safe hemodynamic responses, gradual myocardial conditioning, and improved adherence. Very high intensities (e.g., 90–95% HRmax) are typically inappropriate early on unless the client has progressed through a monitored program and demonstrates strong tolerance; such intensities increase arrhythmic and ischemic risk. Extremely low intensities (40–50% HRmax) may be used for initial deconditioned entry but provide limited stimulus once tolerance is established. RPE-based sprint work at 18–20 is contraindicated for most cardiac clients due to excessive autonomic and pressure load. Interval structures allow close symptom monitoring (angina scale, dyspnea), facilitate titration around antianginal medications (e.g., beta-blockers), and provide opportunities to verify that HR, BP, and ECG-related symptoms remain within safe bounds.