What is the recommended minimum frequency for cardiorespiratory training in adults?

• A. Daily
• B. At least 3 days per week
• C. At least 2 days per week
• D. At least 5 days per week

Answer: (B)

Regular cardiorespiratory training done consistently throughout the week is what drives health benefits and daily functioning. For adults, the minimum frequency to achieve meaningful improvements is at least three days per week. This cadence helps you accumulate the recommended weekly training volume—about 150 minutes of moderate-intensity activity or 75 minutes of vigorous activity, or a mix—without requiring you to work out every day. Spreading sessions over three days provides recovery time between workouts, reduces injury risk, and still leads to cardiovascular and metabolic adaptations. While you can train more frequently—such as five or six days a week—for many people three days per week is the practical minimum to start seeing benefits. For example, you could do moderate-intensity cardio for 30–60 minutes on three days, or longer sessions spread across those days to meet the weekly total.