The scale went down forty pounds. About a third of what left was muscle.

You know the number you started at. You know the number this morning. What you do not know is what the forty pounds was made of.

Here is what the research on this keeps finding, and it is not controversial. On fast weight loss without lifting anything heavy, somewhere between a third and 40 per cent of what comes off is lean mass rather than fat: muscle, and some bone with it. Not the whole loss. A third of it, or worse.

That is why the face changes first. It is why the arms go from soft to loose rather than to firm. It is why you are two dress sizes down and somehow less happy in the mirror than you expected to be at this weight, and why the word people reach for is "drawn" rather than "well".

And it is why the next part is dangerous.

Muscle is where the calories go. It is the largest thing burning anything while you sit still. Take a third of it away and the body you are left with needs less food than the body you started with, at the same weight, doing the same day.

So when appetite comes back, and appetite comes back, it comes back to a body that burns less than it used to. The weight returns as fat, onto a frame with less muscle underneath it than the day you began.

That is not a failure of willpower. It is arithmetic, and it is already running.

What actually decides how this goes

Ask what separates the people who hold their loss from the people who watch it come back, and the answer is unglamorous and consistent.

The ones who keep it share three things: they kept lifting something heavy the whole way down, they ate enough protein while the appetite was gone, and they came down gradually rather than falling off a cliff.

Read that again, because it is doing something unusual for a sales page. That is not my mechanism. It is not a discovery, it is not proprietary, and your own doctor would nod at it. Anyone selling you a secret here is selling you a story.

What almost nobody does is the execution, and the reason is specific: every one of those three is hardest exactly when the drug is working best.

You have no appetite, so protein is the last thing you want. You are down thirty pounds, so the gym feels like a problem for later. Everything is going well, so gradual sounds like an argument for slowing down something that is finally working.

By the time it stops going well, the muscle is already gone. You cannot protect it retrospectively.

The window is now, and it is not long

Two facts about this that are worth having in front of you.

Roughly half the people who start a GLP-1 are no longer taking it a year later. Cost, insurance, side effects, supply, or simply deciding they are done. If you are on one now, "coming off" is not a hypothetical you can defer thinking about. It is the likeliest version of the next twelve months.

And after stopping, most of the lost weight returns inside a year or two.

Both of those numbers describe people who did nothing to protect their muscle on the way down. They are not a prophecy. They are what happens by default, and the default is what this exists to interrupt.

The Muscle You Keep

Fourteen days. Three short sessions a week, twenty minutes each, and one thing to eat differently.

That is the whole thing, and the shortness is the point. This is not a fitness programme and you are not being asked to become a person who trains. You are being asked to hold on to the muscle you still have while your body is in the one state where it will leave quietly.

Every session is a picture. Not a video you have to sit through, not a paragraph describing a position. A drawing of the exact shape, from the angle you need to see it, with the two things that go wrong drawn next to it. You look at it, you copy it, you are done. On a phone, in a bedroom, without changing clothes.

Nothing to buy. The first week is your own body and a chair. The second adds one pair of dumbbells if you have them, and works without them if you do not.

Six sessions in fourteen days. Not thirty. Six. The programme that gets done is the one that fits the day you actually have.

And one thing that is not training at all: the protein floor. One number, worked out from your weight rather than a formula you have to run, and a page of what hitting it looks like on a stomach that does not want food. This is the piece people skip and it is the one that decides whether the training does anything.

What a session actually looks like

Open it. There are four drawings.

The first is the shape you are aiming at, from the side. The second is the same shape from the front, because half of what goes wrong is only visible from one angle. The third and fourth are the two mistakes: the one everybody makes in the first week, and the one that appears in the second when it starts feeling easy.

Under them, three lines. How many. How slowly. What it should feel like, and where.

That is the session. You will spend more time reading this paragraph than deciding what to do.

Do not buy this if

You want it to replace the medication. It does not, it is not a substitute for anything, and nothing in it tells you to stop or change a dose. That is between you and your prescriber, and any page that tells you otherwise is one to close.

You are looking for a diet. There is no meal plan in here. There is one number and a page about hitting it.

You have been told not to exercise. Then this is not the week for it. Ask what specifically, because "take it easy" and "nothing overhead until June" are different instructions, and one of them rules this out while the other does not.

Twenty minutes, three times a week, is not something you will do. Then nothing helps, mine included, and I would rather you kept the money.

The three things people say here

"I will do it when I come off." That is the one that costs the most. The muscle goes while the drug works, not after, and you cannot rebuild retrospectively what you failed to protect. Starting now costs you an hour a week for two weeks. Starting later costs you the muscle.

"I have no energy for the gym." There is no gym. Twenty minutes, three times a week, at home, sitting down for part of it. This is written for somebody eating a third of what she used to eat, because that is who is reading it.

"Is this not just lifting weights?" Yes, in the way a prescription is just chemicals. What is in here is which movements protect the most lean mass for the least time, in what order, at an effort you can hit on very little food, in the two weeks where it matters most. The category is not the protocol.

forty-seven dollars

One payment. Nothing renews, nothing to cancel.

I will not pretend that price reflects the value of the muscle on your frame. It reflects what it costs me to put it in front of enough people, and the fact that you have already spent more on this than you meant to.

Everything opens the moment you are in. There is nothing to wait for and nothing shipped.

If it does nothing, it costs nothing

Do the first week. Six days, three sessions. If nothing about how you feel getting out of a chair has changed, and if you cannot see what the second week would do for you, ask for the money back and it comes back. One button inside the app, no email to me, no reason required.

I would rather refund you in week one than have you find out in month six.

The weight is a number. The muscle is what you get to keep.

You did the hard part. You changed something that had not moved in years, and you paid for it in money and in side effects and in the weeks it took to get used to.

What is left to decide is what stays behind when the drug does. Whether you come out of this smaller and softer than you went in, or smaller and stronger. That is decided now, while it is still working, in about an hour a week.

Fourteen days. forty-seven dollars, once.