Final answer:
An older adult should ideally participate in a cardiovascular program about b. three times a week, according to U.S. Department of Health and Human Services guidelines, which align with the moderate exercise program recommendation.
Step-by-step explanation:
The frequency at which an older adult should be trained in conjunction with a cardiovascular program depends on their individual health status and physical ability. According to the U.S. Department of Health and Human Services guidelines, adults should engage in regular aerobic physical activity for 2.5 hours at moderate intensity or 1.25 hours at vigorous intensity each week. Moderate activities are those that allow a person to talk but not sing, whereas vigorous activities are those that would only allow a person to say a few words without needing to stop for breath. Therefore, taking into consideration the moderate exercise program recommendation, an older adult should train approximately three times per week (b. Three times a week) to meet these guidelines and receive the associated health benefits.