The Vichy Marathon: Flat on Paper, Brutal in the Sun

The Course: Fast, If the Weather Allows

The marathon of the Vichy full distance is run over 4 laps around the Lac d'Allier, passing through the city's parks and historic center, a UNESCO site among Europe's great spa towns. Elevation gain is almost zero: on paper, it's a PB course. In reality, the variable that decides everything isn't the elevation profile. It's the temperature.

The Heat Is the Real Opponent

In 2023, temperatures during the marathon hit 35-37 °C with peaks of 38 °C. Late August in Auvergne can easily top 28 °C even in a normal year. That radically changes how you approach this leg: on this course, the run comes down to managing your stomach and your core temperature, not raw pace.

What that means in practice:

• Acclimatize in the weeks beforehand. Train during the hot hours, building up gradually, if your summer prep allows it.
• Start slower than you want to. The 4-lap format gives you constant reference points: use the first laps to figure out how your body is responding, not to chase a time.
• Watch your cardiac drift. If your heart rate climbs at the same pace, slow down. It's the most reliable sign that your cooling isn't keeping up.

Aid Stations: Use Every Single One

There are 4 aid stations per lap, so 16 passes in total. On-course nutrition is Maurten (GEL 100, CAF 100, Gel 160, Solid 160) and PH 1000 served in paper cups. Two practical notes:

• If you use different nutrition, you'll have to carry it yourself. Deciding on race day is too late: test Maurten products in training now, or plan to carry your own.
• On hot days, every aid station is a cooling station as well as a fueling station: water over your body, head, and neck, plus ice if available. Don't skip a single one, even when you feel good. Heat stroke builds up over the kilometers where you "felt fine."

The 4-Lap Format: Pros and Cons

Multiple laps around the lake have real advantages: crowds and support on every pass, constant pacing reference points, and the chance for family and friends to see you several times without moving. The downside is mental: on lap three you know exactly how much is left, and the temptation to let the pace slip grows. Breaking the marathon into 4 blocks and tackling them one at a time is a strategy many athletes find effective on this kind of format.

Pacing by Goal

Our rough splits (our estimates, not official data) place the marathon like this: around 5:00 for the relaxed finisher, 4:20 for a mid-range goal of around 12:45 total, 3:45 for those targeting 11 hours, 3:20 for top age-groupers. On a 35 °C day, those times need to be adjusted upward without making a drama of it: in 2023 it happened to everyone. Write your Plan B in advance: decide now what your "survival mode" pace will be and under what conditions you'll switch to it.

Practical Checklist

1. Test Maurten nutrition on your long runs over the coming weeks, including caffeinated gels if you plan to use them. 2. Rehearse your cooling routine: dump water on yourself in training to see how your shoes and skin handle 42 km while soaked. 3. Define your heat Plan B: reduced pace, walking the aid stations, a heart rate threshold above which you slow down. 4. Remember the overall cutoff: 16 hours for the medal. If you're a borderline finisher, your marathon margin depends on how much you saved on the bike.

At Vichy, the flat marathon is a gift only for those who reach T2 with fuel in the tank and a clear head. Everything you do in the earlier legs is for exactly that.