How Much Cardio Do You Actually Need?

Ask five people how much cardio you need and you'll get five confident, contradictory answers. Almost none of them are actually about your health.

Half the fitness industry will tell you cardio eats your gains, so skip it entirely. The other half prescribes an hour a day, every day, like it's a tax you owe. Both sides sound sure of themselves. Neither is actually working from your goals.

The real answer is smaller and far less exciting than either camp wants it to be: pick an intensity you can sustain, do it consistently, and the "how much" question mostly answers itself.

THE CARDIO WARS AREN'T WORTH JOINING

If you've ever tried to work out where you land on this, it's not surprising you gave up. One account tells you cardio is catabolic and kills muscle. Another tells you three sessions a week isn't enough and you should be on a treadmill every morning before work. Confusion like this isn't an accident. Contradictory certainty gets more attention than a boring, accurate answer, and a boring accurate answer doesn't sell anyone a program.

Here's what's actually going on underneath it.

Cardio doesn't cancel out strength training. What genuinely gets in the way of building muscle is doing so much cardio, at such high effort, that you've got nothing left to recover with. That's a recovery capacity problem, not a cardio problem, and it only shows up at volumes most people training for general health never get anywhere near.

So the question was never really "cardio or no cardio." It's whether what you're doing leaves you enough left over to recover and keep training.

THREE INTENSITIES, AND HOW TO TELL THEM APART

You don't need a heart rate monitor or a lab test to know what zone you're in. Your ability to talk gives it away.

Low intensity means you can hold a full conversation without losing your breath — a brisk walk, an easy bike ride. Moderate means you're still talking, just not well enough to sing along to anything. Push into high intensity and talking stops being an option at all.

None of these is "the right one." Which you reach for depends on what you're training for. Chasing a specific event or sport? Train the intensity that event demands. Training for general health? The honest advice is to pick whatever you'll actually enjoy enough to keep doing. Cardio you dread doesn't get done for long, no matter how correct it looks on paper.

WHERE IT ACTUALLY FITS AROUND THE WEIGHTS

Cardio doesn't need its own slot carved out of an already packed week. If you're already at the gym for a strength session, that's usually where it belongs: 10 to 20 minutes at low to moderate intensity, done after the weights rather than before them, so it isn't eating into the effort your lifts need.

You don't need much of it, either. Even 10 to 15 minutes a day makes a real difference to your cardiovascular health for most people chasing general health rather than a specific performance goal.

On the days you're not lifting, a walk covers it. Simple, low effort, nothing to plan around.

That's really the whole decision. Pick an intensity you'll actually keep doing, tack it onto the end of a session you're already showing up for, and stop trying to win an argument the industry invented to keep you unsure in the first place.