Cardio fitness for regular people

The short version

Move at a conversational pace for 60 to 150 minutes a week, and hit roughly 8,000 steps a day. Getting off zero is the biggest win available.

Your Apple Watch says "low cardio fitness." Or your last checkup put your resting heart rate higher than expected. Or you walked up two flights of stairs and noticed something. The question is the same: what does it actually take to get fitter, and do you have to suffer for it?

The answer is more accessible than the fitness industry admits.

The biggest gain comes first

Research on aerobic fitness and mortality shows a consistent pattern: the largest drop in risk comes from moving off zero. Going from sedentary to a little regular movement buys more than any subsequent upgrade. The first hour of weekly movement you add matters more than the difference between 60 minutes and 150.

You are not trying to become an athlete. You are trying to not be sedentary.

Build a base at a pace you can talk through

The core of cardio fitness for health is a steady base of easy aerobic movement: 60 to 150 minutes a week, spread across however many days suits your schedule. Walking, cycling, swimming, a slow jog, a Pilates class that gets you breathing. Any of it counts.

The right intensity is easy to find without any gadget. If you can hold a full sentence while moving, you're in the right zone. If you're too winded to talk, ease off. No chest strap required, no zone-2 calculator.

Consistent weeks matter more than perfect sessions. Three 30-minute walks beats one long Saturday run followed by six days of nothing.

8,000 steps a day is most of the job

A step floor of roughly 8,000 steps a day captures most of the aerobic benefit without any formal exercise session. Incidental movement counts: walking to the meeting, taking the stairs, a 10-minute walk after dinner. You are not tallying gym minutes.

If you're currently averaging 3,000 steps, getting to 5,000 is a bigger win than aiming for 10,000. Move the floor up, not the ceiling.

Break up long sitting

Long uninterrupted sitting carries its own risk, separate from whether you exercise. Standing up and moving for a couple of minutes every hour you're seated blunts that effect. Set a timer, walk to the kitchen, take the long route to the bathroom. The bar is low on purpose.

Add a little intensity, once or twice a week

Once you have a base of regular easy movement, a small amount of harder effort on top delivers a real additional benefit. A flight of stairs taken fast, a 30-second push on a walk, a set of jumping jacks. Three to five minutes of elevated effort once or twice a week is enough to shift the needle. Going a little harder for a short burst is accessible to almost anyone who can already walk.

Skip the heart-rate-zone obsession

You do not need to know your VO2 max. You do not need a GPS watch that codes sessions by color. Zone 2 describes easy, sustainable aerobic work. As a precise protocol requiring heart-rate gear and lab testing, it's more complexity than the evidence supports for most people.

Easy, judged by feel, is enough. A little hard, a few times a week, is also enough.

No food rating for this pillar

Cardio fitness is a movement pillar. GoodEnough does not attach a food score to it because the relevant levers are how you move, not what you eat. When your focus is set to cardio fitness, the app sends movement nudges: step count reminders, sitting-break prompts, a check-in on whether you got your easy movement this week.

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Sources

• Outlive, Peter Attia
• Exercised, Daniel Lieberman

For the full evidence base, methodology, and source books, see the Science behind GoodEnough page.