Most healthy adults need roughly 150 minutes of moderate cardio per week for general heart health, about 20-30 minutes, five days a week, with more added on top depending on whether your goal is fat loss or performance. Beyond that baseline, "how much cardio" stops being one universal number and starts depending entirely on what you're actually training for.
The baseline: general health
Major health bodies converge on a similar number: the CDC's physical activity guidelines recommend roughly 150 minutes of moderate-intensity cardio per week (or 75 minutes of vigorous-intensity), spread across most days. This is the floor for cardiovascular health: lower risk of heart disease, better blood pressure, better insulin sensitivity, regardless of whether you're trying to lose weight or build muscle. If you're doing zero cardio right now, getting to this baseline is the single highest-value change you can make, well before worrying about optimizing further.
If your goal is fat loss
Cardio burns calories, which can help create the deficit needed for fat loss, but it's a smaller lever than most people assume. A 30-minute moderate jog burns roughly 250-350 calories for most adults; a modest reduction in daily food intake achieves the same deficit far more reliably and consistently than trying to "outrun" your diet.
That said, cardio has a real role in fat loss beyond pure calorie burn: it makes the deficit easier to sustain (more room in your calorie budget), and higher activity levels are associated with better long-term weight maintenance after fat loss. A practical target for active fat loss: 3-5 sessions per week, 20-40 minutes each, mixing moderate steady-state (walking, cycling, easy jogging) with one or two harder interval sessions.
If you're strength training and worried cardio will hurt your gains
This is a common concern, and it's mostly overstated at moderate volumes. Doing 2-4 cardio sessions a week alongside a structured strength program does not meaningfully interfere with muscle or strength gains for most people. Where interference becomes real is at high volumes (daily long-duration cardio) combined with insufficient calories and protein, the cardio itself isn't usually the problem, the recovery deficit around it is.
Practical approach: keep cardio sessions separate from your hardest lifting days when possible, or do them afterward rather than before (so leg strength for squats/deadlifts isn't pre-fatigued), and make sure your calorie and protein intake accounts for the added activity.
What type of cardio matters less than consistency
Walking, cycling, rowing, swimming, and jogging all count. The "best" cardio is the one you'll actually do consistently, a 30-minute walk you do five times a week beats an intense HIIT session you dread and skip half the time. If joint pain is a concern, low-impact options (cycling, swimming, incline walking) let you accumulate the same cardiovascular benefit with far less wear on your knees and hips, a point the Johns Hopkins Medicine guide to low-impact exercise covers well.
A simple weekly structure to start with
- 3 days: 20-30 minutes of moderate-intensity cardio (a pace where you can talk but not sing), walking, cycling, or the elliptical.
- 1 day (optional, once the above feels easy): a harder interval session, e.g. 8 rounds of 1 minute hard / 2 minutes easy.
- Rest of the week: normal daily activity (walking, stairs) plus your strength training.
Build up gradually if you're starting from very little activity, jumping straight to daily hard cardio is a common way to burn out or get injured in the first few weeks. Track your sessions the same way you'd track a lifting program; consistency over months is what actually produces the heart-health and fat-loss benefits, not any single "perfect" week.
