The mock peak week: rehearse it before the stage

A mock peak week is a full rehearsal of the final week, run while there is still time to change the plan. It is the one recommendation the peaking literature and the coaching room agree on without argument, and it is the step most coaches skip, usually because the calendar is tight and the client is already tired. The cost of skipping it lands in the one week of the prep that cannot absorb a surprise.

The protocol itself, the order the levers move in and the structure of the final seven days, lives in the peak week protocol. That page is the plan. This one is the rehearsal, which is a different job with a different set of decisions attached.

Why the mock week is not optional

The recommendation is explicit in the evidence. The 2021 review of peaking practice, published in BMC Sports Science, Medicine and Rehabilitation, tells coaches to run a practice week roughly two to four weeks before the competition, and gives two reasons for it. The first is that it reduces anxiety and shows the competitor the plan is manageable and effective. The second is that it produces information about the right extent and timing of the changes.

The anxiety half is not soft, and it is the part coaches treat as a bonus rather than a mechanism. That review describes how psychological stress raises cortisol and aldosterone, both of which hold fluid, and how a stressed competitor retains body water in the middle of a plan designed to shed it. In the extreme cases it documents, body mass has risen by up to 9 kilograms in 48 hours under emotional stress alone. A client who is frightened of the final week arrives holding water whatever the spreadsheet says, so the rehearsal is a physiological intervention as much as a psychological one.

The same review draws the line that makes the mock worth the disruption. For a competitor who has never tested a water or sodium manipulation, keeping both constant may be the best approach available. A mock is how a coach earns the right to move them at all. A mock that ends in the decision to hold everything steady is a successful test, not a wasted week.

When should you run a mock peak week?

Run it two to four weeks before the show. That is close enough that the client is already lean and the variables are real, and far enough out that a failed protocol leaves time for a second attempt. The 2024 carbohydrate review puts the individualisation work earlier still, one to two months out, and the two windows are not in conflict: the earlier run shapes the plan, the later one confirms it.

Matching the conditions matters as much as the date. The 2024 review is specific about this, asking for a trial in a physiological state as close to the real week as the calendar allows. In practice that means the client is already lean, already in a deficit and training normally. A rehearsal staged during a diet break, a holiday or the week after a deload is a trial of a different week, and the result will not transfer.

What "the same conditions" means, in the order coaches usually forget it:

• The same leanness. A mock run eight weeks out, before the last of the fat has come off, tests a body that is not the one going on stage.
• The same intake. Same calorie level, same macro split, same foods, same meal timing.
• The same training week. Not a deload, and not a peak week for a different show.
• The same measurement routine. Same scales, same time of day, same four poses, same light, same camera distance.

How many mocks a client needs depends on how much is new. A first-time competitor with an untested plan needs at least one, and a coach who changes two or three levers after reading it needs a second. A returning client whose last peak worked is not rehearsing the whole protocol, only the parts that changed: a new division, a different bodyweight, a different carbohydrate source, an earlier show in a longer season.

One scheduling rule holds regardless. Never run the mock in the week before the show. There is no reaction time left in it, and the client pays for the experiment on stage.

What the mock week actually tests

A mock is a controlled test, and the control is the whole point. Both reviews recommend manipulating as few variables as possible, and the 2024 paper frames the exercise as building a personal response pattern. The coach is not hunting for the best protocol in the abstract. They are looking for one client's reaction to one version of it.

So the first mock runs the plan with the fewest levers it can work with, not all of them at once. If the read is clean, the second mock adds one more and isolates its effect. If the first read is muddy, the coach has learned something useful anyway, which is that the protocol moves too many things at once to be legible.

Read the table from the right-hand column first. A mock that answers one question cleanly is worth more than one that half-answers four.

The failure modes and what each one means

Five outcomes cover most mock weeks, and the last of them is the one coaches misread.

Flat. The client looks smaller and flatter a week later rather than fuller. The carbohydrate usually did not land, because the volume was too small, the timing did not suit their day, or the gut did not absorb it. The reading is a smaller or better-spread load. Adding a second lever to fix a flat look is how a coach loses the ability to attribute anything.

Spilling over. The look softens, the waist blurs and the weight climbs further than the plan assumed. Too much arrived without the training stimulus to use it. The reading is a smaller load, and the training week is worth a second look before the carbohydrate gets blamed for everything.

Gut distress. Bloating, constipation or the reverse, usually within a day of the load. Carbohydrate type and volume are the suspects, and the mock is the only place to find out which. A client in the real week will not report it clearly, because by then it is too late to change anything and they know it.

Cramping. This one stops the test. Cramping in the limbs or during posing is the signal to end the manipulation and send the client to a doctor rather than to adjust the amount. Both reviews record serious electrolyte cases, and part of the value of a rehearsal is that a coach should never have to learn that lesson live.

Almost nothing. The weight moved a little, the photos look roughly the same, and the client felt fine. This is the most common result and the most misunderstood. It is also the result the best available trial predicts.

That trial is a 2024 randomised crossover study in the journal Nutrition, and it is the closest thing to a direct answer on how much a peak week actually changes. It put four dieting men through three days at a low carbohydrate intake and then a loading phase, against a placebo, and measured muscle thickness with ultrasound rather than by eye. Loading raised muscle thickness by about 2.9% from the depleted state, and the placebo arm showed no such change. The authors' own conclusion is careful: the change may not be large enough to exceed the measurement error and the ordinary day-to-day fluctuation in a physique. Their recommendation is to individualise by testing before competition and to judge the result visually.

Sit with that for a moment. A mock week that produces a small, arguable difference is not a failed experiment. It is what the evidence predicts for most people, and the honest reading is that the lever may be worth less than the coaching corpus assumes. The decision then becomes whether a small effect justifies the disruption of the week, and for plenty of clients the answer is that it does not. That is a finding, and it belongs in the client conversation.

This page carries no water or sodium amounts, in the mock or in the real week, and the omission is deliberate rather than an oversight. The protocol page sets out the evidence behind that line and the hospitalisation cases that sit under it. What matters here is narrower. A mock can rule a fluid manipulation out. It cannot license one, and a test that ends in holding water and sodium steady has done its job.

Recording the mock: photos, weight and the check-in log

The rehearsal is only worth the disruption if the record is comparable to the real week. That means the same weigh-in routine, the same photo setup and the same questions, so the two series can be laid side by side later.

Four things belong in the record: morning weight under identical conditions, the photo series in the same poses and light, the food log as it was actually eaten rather than as it was planned, and a short set of feel questions. Energy, sleep, appetite and gut are the four that change a coach's reading most, and none of them show up in a scale number.

The last line is the one that gets dropped, and it is the one that matters. A log of what happened without a note of what the coach decided turns the real week into a memory exercise a month later. Write the decision down while the photos are still on the screen.

Where the log lives decides whether it survives. A prep record spread across a spreadsheet, a photo app and a message thread stops being a record by the second month of a prep, and the mock is exactly the week a coach notices. The prep check-in guide covers what the weekly ritual has to hold for the comparison to mean anything. Online coaching client check-ins covers the cadence underneath it, and physique prep coaching software walks through what the photo series and the weight trend cost to hold at a real roster.

What changes for the real week

The mock sets the starting point. The real week runs the version of the plan the mock validated, and the gap between the two should be as narrow as the coach can make it.

If the mock gave a clear read, change one thing at most, and only the thing the read pointed at. If the mock was ambiguous, run the real week with fewer variables rather than more. Ambiguity is not a reason to add a lever the client has never tried. It is a reason to simplify until the picture is legible.

Two things do not change between the mock and the real week. The taper keeps its shape, and the general method belongs to the training taper entry rather than to this page. The daily check-in keeps its cadence, and the read stays on the trend rather than on any single morning.

Training inside the week is where autoregulation earns its place, since a client who slept badly on the Tuesday of peak week is not the client the plan was written for. The boundary that scope of practice draws applies here exactly as it does everywhere else in prep, and the rehearsal does not move it.

One rule sits above all of this. Nothing new goes into the real week that was not in the mock. New food, new supplement, new training method, new fluid plan: all of it waits for the next prep. A mock only buys certainty about the things it actually tested, and a coach who adds one untested variable at the last minute has spent the rehearsal for nothing.

And the honest limit. The rehearsal narrows the range of outcomes. It does not close it. Lighting, nerves, the pump-up room and the judges' preference all sit outside the plan, which is why this is a discipline rather than a guarantee. The rest of the reference library, from programming methods to credentials, sits in all coaching guides.

Frequently asked questions

How many mock weeks do I need?

One is the minimum for a first-time competitor with an untested plan. A second is worth running if the first read was unclear or if the coach changed more than one lever afterwards. A returning client with a peak that already worked does not need to rehearse the whole protocol, only the parts that changed since the last show.

What if a client refuses to restrict water in the mock?

Agree with them, and note it. The 2021 review's position for an untested competitor is that holding water and sodium constant may be the best option available, so the refusal costs the coach a lever that was never established as useful. Record the decision, run the week with the remaining levers, and leave the fluid plan alone in the real week too.

What if there is no time to run a mock?

Then do not manipulate. The same review answers this directly: when no practice run has happened, keeping water and sodium as constants is the approach that minimises the variables at play. A coach with a late booking and a tired client is better served by a well-executed taper and carbohydrate plan than by an untested experiment in the final week.