Race Intelligence · Thun, Switzerland
Lake Thun starts the day among the Alps. The cycling moves away from that water towards Spiez, Gürbetal and the Gantrisch region before bringing you back for a three-lap marathon through town. This is a course with no room for an impatient first bike lap.
Lake Thun, a view of the water and snowy Alps.
Your day in Thun
I’m Tom, the coach behind Sense Endurance Coaching. Tell me where you are now and I’ll show you what a strong day in Thun could look like.
The course behind your race
Thun brings a 3.8 km lake swim, two bike laps totalling roughly 180 km and three run loops past Schadau Castle park and Scherzligschleuse bridge. Those are the broad 2027 landmarks; exact turns still need checking before you plan around them.
Lake Thun, full-distance swim
The single loop in Lake Thun gives you the cleanest part of the day first. Find breathing and rhythm early instead of trying to create time before the course becomes expensive.
Seed honestly. Settle early.
Road towards Spiez, first bike section
Fresh legs make the first Alpine loop feel more generous than it is. Cap the climbs at an effort you are willing to repeat after ninety kilometres and let the descents reduce cost rather than become another target.
Cap power uphill. Fuel before the climbs.
Gürbetal and Gantrisch area, bike middle
The second loop is the real audit of the first. Keep the same sustainable climbing ceiling, accept any loss of speed that comes with fatigue, and finish the nutrition job before the three-loop run begins.
Stay patient. Finish planned fuel.
Thun return roads, later bike
The first pass through Thun should tell you what the bike left, not prove what the marathon target was. Keep stride and breathing controlled as the course changes rhythm around the bridges and lakeside sections.
Easy first aid station. Stay tall.
Schadau Castle park, opening marathon
The repeated route gives you comparison points. Add effort only when posture, breathing and pace still support it; otherwise keep the strongest sustainable rhythm and let the final loop, not the first, become the race.
Shorten stride on bridges. Choose the last move late.
Check the 2027 lake entry, both bike laps via Spiez, Gürbetal and the Gantrisch area, and the three run circuits through Schadau and Scherzligschleuse. Confirm the exact aid stations, transitions, cutoffs and lake conditions before choosing landmark-specific targets.
A race-day forecast is not meaningful yet; check back closer to the event.
Historical baseline, 2019–2025 · Open-Meteo historical archive · Updated 2026-09-15.Historical comparison only. This is not a forecast for 2027.
Make your finish prediction and I can send this plan to you in race week.
Prepare for Thun
A finish range gives you something to work towards. The preparation is specific to this race: full-distance climbing restraint and steady bike nutrition are rehearsed for both 90 km circuits, making the first marathon lap deliberately comfortable.
I’m Tom. With Sense Endurance Coaching, I’ll build that preparation around your life, follow how you respond and adjust the work as you get closer to Thun.
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