Race Rehearsal: The Dress Rehearsal Before Race Day

Most races are not lost on race day. They are lost in the weeks before — to untested shoes, fuelling that upsets the stomach, or an opening pace ten seconds per kilometre too fast. A race rehearsal is the only session that finds those mistakes while they still cost nothing. It is neither a race nor a fitness test: it is a dry run under race conditions.

Why a rehearsal is not a race

A rehearsal has a different purpose than a race. It is not meant to show how fast you are, but whether your system works. That distinction matters in practice. Run the rehearsal as a race and you go full gas, produce maximum soreness and need two weeks to recover — exactly in the phase where form should be building. Run it as a test and you collect the same information at a fraction of the load.

What gets tested is the chain that has to work on race day: clothing without chafing, shoes without pressure points, fuelling without stomach trouble, pacing without a blow-up, and the logistics from watch to gels to transition. Any of those can ruin a good day — and every one of them can be checked beforehand.

The right timing: two to four weeks out

The timing follows simple logic: far enough from the race to act on what you learn, close enough to test under realistic conditions. For the common distances that means:

• Marathon: 21 days out (T−3 weeks). The last long run is done, fitness is there, and three weeks remain for corrections.
• Half marathon and 10 km: 14 to 17 days out. Shorter races forgive more, but the window for changes is smaller.
• Olympic and middle-distance triathlon: 14 days out, with full transition simulation (T1 and T2). For long distance, 21 days.
• Gran fondo: 14 to 21 days out, testing nutrition over four hours and your position on the bike.

Do not put it in the taper week. The final 10 to 14 days exist to shed fatigue — a rehearsal there imports exactly the load you are trying to get rid of. More on that in Tapering: The Final 14 Days Before Your Race.

What the rehearsal should check

A good rehearsal has a checklist, not a target time. These six items belong on every list:

• Gear: shoes, socks, jersey, shorts, padded bibs, helmet, glasses. Anything that rubs, pinches or shifts shows up after 90 minutes at race pace — not after 45 easy minutes.
• Fuelling: gels, bars, drink mix, sodium. Test not only tolerance but handling: can you open a gel at pace without stopping?
• Pacing: can you hold goal pace without overreaching? Especially in the first kilometres.
• Technique under fatigue: cadence, foot strike and posture in the final half hour — that is where form breaks first.
• Routine: getting up, breakfast, travel, warm-up, last toilet stop. Race day is a logistics exercise, and most mistakes happen before the gun.
• Equipment in race mode: watch with the race screen, chest strap, bike computer with course data. Changing your display for the first time on race day costs time and nerve.

Dosing: how long and how hard

The most common mistake is a rehearsal at full race distance. It is counterproductive: recovery demand nearly matches a real race while the benefit does not grow. The proven principle is "partial distance, full intensity": you cover part of the race distance, but at true race pace and with true race fuelling.

• Marathon: 18 to 24 km total, of which 8 to 12 km at marathon pace. The rest easy as warm-up and cool-down. That is 60 to 70 percent of race-day load.
• Half marathon: 10 to 14 km, of which 5 to 8 km at goal pace.
• 10 km: 6 to 8 km with 3 to 4 km at race pace — often a small local race works well here.
• Triathlon: half the bike distance at race pace plus a 15 to 20 minute brick run. Rehearse both transitions completely, including peeling off the wetsuit.
• Gran fondo: 3 to 4 hours with two or three blocks at goal pace and full fuelling; a sportive nearby is ideal for this.

A rehearsal replaces a quality session in that week, it does not come on top. Follow it with 48 hours without intensity — the load sits at 60 to 80 percent of race day, and that is the range the body needs to process.

Worked example: rehearsal for a 3:45 marathon

Goal pace 5:20 min/km. The session sits on a Saturday, 21 days before the race:

• Breakfast: identical to the planned race-day breakfast, three hours before the start. Not "something substantial" — exactly what you intend to eat on race day.
• Warm-up: 10 easy minutes plus running drills, as on race day.
• Main set: 6 km easy (6:00 min/km), then 12 km at 5:20 min/km, then 4 km cool-down. 22 km total.
• Fuelling: a gel at kilometre 5 and kilometre 12, each with water. The drink you planned, not whatever the fountain offers.
• Afterwards: 20 minutes of rest, then the intended recovery meal — that gets tested too.
• The week after: easy on Monday and Tuesday, no tempo run. The rehearsal is the last hard session of this block.

The value is not in the 12 km at race pace but in the information: how does that pace feel after 80 minutes? Does the stomach hold the gel under load? Does the seam on your back start to press after an hour? Those three questions are worth more than any training prescription.

Race-day checklist

The rehearsal is the last chance to test your routine. This checklist should be completed in full during the test:

• Evening before: lay out all clothing, pin the bib, count gels, charge the watch, go over the course and the journey. Anything missing shows up now — not at 6:30 a.m.
• Morning: alarm at the planned time, breakfast at the planned time, toilet routine. The body needs two to three weeks to settle into a new rhythm, so practise it now.
• Warm-up: fixed order, fixed duration. A warm-up you have done ten times costs no nerve on race day.
• Fuelling plan: write down when you take which gel and how much fluid. Not "by feel" but by plan — and validate the plan in the test.
• Goal pace: deliberately 5 to 10 seconds per kilometre slower for the first kilometres. That is the one pacing rule almost everyone underestimates.
• Contingency: what happens in rain, heat or with stomach trouble? One sentence per scenario is enough, but it should have been thought through beforehand.

The four most common mistakes

• Too long. Anyone rehearsing the full race distance is not testing, they are racing — with two weeks of recovery. The benefit is no bigger, the risk significantly higher.
• Too late. A rehearsal seven days before a marathon only adds uncertainty. New findings cannot be implemented, and the load lands in the week where it hurts most.
• Changing everything at once. New shoes, new gel and new pacing simultaneously — if something goes wrong you cannot tell what caused it. One variable per test, keep the rest known.
• Over-reading the test day. A bad day three weeks out usually says more about sleep, weather and the days before than about fitness. Check the circumstances first, then the plan.

What the test says about form — and what it does not

A rehearsal is not a performance test. A 12 km block at marathon pace does not translate into a target time, because it runs under different conditions: fresher, shorter, without race stress. Anyone deriving a prediction from a rehearsal typically overestimates by three to five percent — and then starts too fast.

Reliable form information comes from tracking load over time, not from a single day. The CTL/ATL/TSB curve shows how fitness and fatigue develop over weeks and is the more dependable basis for choosing a goal time. The rehearsal answers a different, more practical question: does my setup work?

Rehearsing in triathlon

In triathlon the rehearsal is more complex because more components come together. Three things matter: first, rehearse the transitions completely — wetsuit off, helmet on, shoes on, in the planned order and with the planned technique. Second, test fuelling on the bike, because 80 to 90 percent of energy is taken on there. Third, the brick run: the first two kilometres off the bike always feel bad, but they should feel normal after about five minutes.

There is a dedicated article on transitions: T1 and T2: The Fourth Discipline in Triathlon. A rehearsal that only covers swimming and cycling omits exactly the part that most often costs time on race day.

How Peakora builds the rehearsal into your plan

In the Peakora engine the rehearsal is a dedicated session within race preparation: three weeks before the A race, partial race distance with a race-pace block, followed by 48 hours without intensity. Because the plan manages load through TSS, the session does not appear on top of the week — it replaces a quality session, so weekly volume stays inside the planned corridor.

In practice you do not have to work out how much race distance makes sense three weeks out. The plan knows your goal race, your distance and your current form state and places the rehearsal accordingly. For the wider picture on race preparation and periodisation, the marathon training hub covers build, volume and tapering.

Frequently asked questions

Related reading: Race Day Checklist, Marathon Pacing Strategy and Peaking for Races. Terms like TSB, TSS and race pace are explained in the Peakora glossary.