Alright, let me tell you what came across my desk this week.

Guy online, big following, telling his audience they can skip cardio for good. Ten thousand steps a day and you are covered for life.

Let's do the math.

Ten thousand steps is about four and a half miles. At a normal pace that is a walk, and a walk sits somewhere around 50 to 60 percent of your max heart rate.

Nothing wrong with that. Walking every day is one of the best things a man can do for his body.

It just does not touch the number that decides your next twenty years.

Cover your right eye with your hand.

Look at the bright square below.

Now switch and cover your left.

Did one side look dimmer? Yellower? A little washed out?

Which eye dimmed?

▸  The right eye looked dimmer

▸  The left eye looked dimmer

▸  They look exactly the same

▸  I’m not sure (show me the answer)

Most people swear both eyes see the same.

They don’t.

When the blood vessels feeding one eye start to collapse, that eye loses oxygen first… and the world quietly dims on that side before you’d ever catch it on a chart.

A 2026 breakthrough from a rogue eye doctor built this into an 8-second morning flush that reopens those vessels and 73,247 people have used it.

See what your dimmer eye is trying to tell you (and how to fix it)

VO2max

The most oxygen your body can pull in, move, and actually burn in one minute.

Call it your engine size.

Now, about that ten thousand. It was never a research finding.

It came from a Japanese pedometer sold in 1965, the manpo-kei. Ten thousand step meter. A round number that fit on a box.

The studies that have actually counted steps find the benefit flattening out well before ten thousand. The number traveled anyway, because round numbers do.

And moving your VO2max takes something a walk does not deliver: time spent up near the top end, where your breathing gets ugly.

So why should a man with a business to run care about his oxygen number?

Because after 30 it drops roughly 10 percent per decade, and the slide gets steeper after 50.

Cleveland Clinic ran treadmill data on more than 120,000 people and published it in 2018. The least fit group carried a mortality risk on par with smoking.

That is the headline. Here is the part nobody says out loud.

Your ceiling decides what percentage of you an ordinary Tuesday costs.

Say the day takes 12 units of effort out of you. Big engine, that is 40 percent of what you have, and you walk in the door with something left.

Same day, smaller engine, and now it is 60 percent. Same meetings, same drive home, same kids at the door.

One man is tired. The other one is finished.

So the guy across the table who never seems to fade is not tougher than you. He just has more room above his workload.

And the system that sets that ceiling is the same one feeding your brain. Heart, blood, vessels, oxygen.

There is no separate pipe running to the part of you that solves problems.

Which is why a bigger engine shows up at 4pm as clear thinking, not just as a faster mile.

Now the honest part of the chain. Training builds the engine, but the oxygen gets used deep inside your cells, in the mitochondria, and that machinery runs on cofactors.

CoQ10 is the one worth knowing. It ferries electrons through the energy chain, it declines with age, and statins push it lower, which is a conversation for your doctor and not a reason to stop anything.

Almost nobody eats that stuff on purpose. That is a fair place for a quality supplement to earn its spot.

One session this week where you cannot hold a conversation. Four minutes hard, three minutes easy, four rounds. Hill, bike, rower, stairs, does not matter.

Your engine has not been asked a serious question in years. Ask it one.

Ten thousand steps will keep you walking. It will not raise the roof that everything else you do has to fit under.

You are not tired because the days got harder.

You are tired because the engine got smaller. That one you can still fix.