If cardio had a middle child — reliable, undramatic, quietly doing all the important work while the flashier siblings get the attention — it would be Zone 2.
Nobody posts their Zone 2 workout with a caption like “crushed it.” It doesn’t feel like much while you’re doing it. And that’s exactly why so many women skip right past it, chasing something that feels harder, sweatier, more “worth it.” Which is a shame, because Zone 2 might be the single most important kind of cardio for a woman in midlife.
What Zone 2 Actually Is
Your heart rate lives on a spectrum, usually broken into five zones based on the percentage of your max heart rate. Zone 2 sits at roughly 60–70% of that max — an effort that’s noticeably more than resting, but nowhere near hard.
You don’t need a lab or a fancy watch to find it. The simplest test is the talk test: you should be able to hold a full conversation, in complete sentences, without gasping for air. If you can comfortably chat or breathe through your nose the whole time, you’re likely in the right zone. If you have to pause between sentences, you’ve drifted out of it.
Practically, this looks like a brisk walk, an easy bike ride, a relaxed swim, or a light jog if you’re already well-conditioned. It should feel almost too easy. That feeling is not a sign you’re wasting your time — it’s the point.
Why It Matters More Now Than Ever
As we move through perimenopause and menopause, several things are shifting at once: how efficiently our cells produce energy, how our bodies use fat as fuel, and how resilient our cardiovascular system is under stress. Zone 2 training speaks directly to all three.
Sustained, low-intensity effort is one of the most effective ways to build mitochondrial density — essentially growing more of the tiny engines inside your cells that produce energy. More efficient mitochondria means more steady energy across your day, not just during your workout.
It also trains your body to preferentially burn fat for fuel at rest and during everyday movement, builds a genuine aerobic base that makes harder efforts (including your strength training) more sustainable, and — this is the part I want you to really hear — it does all of this without spiking cortisol the way harder efforts can. It’s cardiovascular training your nervous system can actually recover from.
Meet Renee
Renee is 51 and, for years, believed her only two workout settings were “nothing” and “all out.” She’d either skip movement entirely or push through a brutal class that left her wiped out for the rest of the day.
When she added three 35-minute walks a week — genuinely easy, phone-a-friend-while-you-walk easy — she expected nothing to change. Instead, her energy in the afternoons improved, her sleep steadied, and she realized she’d been mistaking exhaustion for effectiveness her whole adult life.
How Much Zone 2 Do You Need?
Most of your weekly cardio — the majority of it — should live here. Think 3 to 5 sessions of 30 to 45 minutes. It doesn’t have to be its own dedicated “workout,” either. A walk after dinner counts. Pushing a stroller counts. Gardening at a steady clip can count. The goal isn’t a specific class; it’s an accumulated dose of easy, sustained effort across your week.
Next week, we’re heading to the other end of the spectrum: short, hard efforts done on purpose — and the zone in between that quietly drains so many women without ever delivering the payoff of either extreme.
Curious what a week of intentional movement — cardio and strength, without the guesswork — actually looks like? That’s exactly what we build together inside The Strength Collective and in 1:1 coaching.