Happy Thursday!
Ever heard of the concept of perishable skills?
I wrote about this in my personal journal this week and wanted to discuss it in a non-peptide email today (although I promise I’ll tie in peptides).
The idea is simple. Some skills decay the moment you stop using them.
Speaking. Writing. Selling.
You take three weeks off, and the edge is gone. You feel it the second you try to step back in.
I learned this first on the football field.
When I played, going more than a few days without live tackling was a problem.
If you skipped contact during the week, it took a few drives in the game to find your groove again. And by that time it may have been too late.
The body forgets fast. So I always wanted at least a little tackling on a Tuesday practice. I personally needed the reps to stay sharp.
Your physiology works exactly the same way.
One Question
Every system in your body is constantly running a cost-benefit analysis. It keeps what you use. It cuts what you don't.
Muscle is expensive to maintain. So is bone density. So is a high VO2 max, which is just a measure of how well your body uses oxygen during hard effort. These things take real metabolic energy to hold onto.
The moment you stop demanding them, your body starts cutting the cost.
It assumes that if you are not using a capacity, you do not need it. So it lets it go.
The technical word for losing fitness is detraining. And the detraining curves are faster than almost anyone expects.
Speed
A few examples to make this real.
VO2 max starts to drop within two weeks of stopping endurance training. Some studies show meaningful losses within 12 days.
Muscle strength holds a little longer, but the signaling that builds muscle drops off quickly once the stimulus is gone.
Insulin sensitivity, which is how well your cells respond to insulin and pull sugar out of your blood, can worsen after just a few days of inactivity.
One stretch of sitting around can move the needle the wrong way.
Even your mitochondria start to decline when the demand disappears.
The pattern is always the same. Stop sending the signal, and the body stops paying for the capacity.
An Inconvenient Truth
There is no finish line.
You do not earn fitness and then bank it for life. You rent it. The rent is due every week.
The body only cares what you are asking of it right now.
I think this is why so many people get frustrated. They treat health like a project with an end date. Lose the weight, hit the goal, then coast.
Unfortunately, things don’t work like that.
The same thing is true for the longevity tools we talk about all the time.
Peptides are great. I use them, and I believe in them.
But a healing peptide does not override the fact that an unused muscle still atrophies. The compound supports the work.
Final Thoughts
The people who age the best are the ones who never fully stop.
They keep lifting. They keep moving. They keep their heart rate up multiple times a week, every week, for decades. They pay the rent.
I think about my own training this way now. I train because the day I stop is the day the clock starts running backward.
Big takeaway.
Pick the few capacities that matter most. Strength. Cardio. Metabolic health. Then send the signal consistently enough that your body never decides to cut them.
Use it or lose it. It is how your physiology actually works.
And to close out with one of my favorite slogans that a coach used to yell…”Pay the rent!”
Best,
Hunter Williams