Jamie is a 62-year-old female who is referred to outpatient cardiac rehabilitation 3 weeks after a myocardial infarction. She reports feeling fatigued with moderate exertion but denies chest pain. Her resting vitals are HR 80 bpm, BP 128/82 mmHg, and SpO₂ 98%. She completed Phase I rehabilitation without complications and is eager to begin exercising to improve her endurance. Which activity is MOST appropriate to initiate during Phase II of cardiac rehabilitation?

A) Jogging on a treadmill at 70% maximum heart rat

B) Cycling on a stationary bike at 3-5 METs

C) Strength training at 50% of 1-rep max

D) Stretching and light walking only

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