Trail race training blueprint
A marathon beneath the roof of the Alps.
At 43.2 km with 2,387 m of climbing, this distance challenges both endurance and climbing ability without the time-management demands of a full ultra. At 55 m of vertical per kilometer, much of the course is runnable — the plan focuses on building your aerobic cruising speed while preparing you for the steeper sections. The official cutoff is 12 hours, so pace management starts from week one.
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Mix of valley paths, forest trails, and alpine terrain. The Aiguillette des Posettes climb is long and steep.
Late June: warm valleys, cool and potentially stormy at altitude.
Swap concrete training days, or mark a day done/skipped without changing the race-specific template.
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Key sessions include route buttons that deep-link into the Planner with pre-filled distance + elevation filters.
The plan is scaled from the race profile, not a generic road-running template.
Training emphasis: rolling aerobic speed, moderate hill repeats, and disciplined pacing.
If your race has a time limit, this estimates the minimum average pace and whether your target finish time clears the cutoff.
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Disclaimer: this plan is general information, not medical advice. Adjust based on fatigue, experience, and injury history.
At 43.2 km with 2,387 m of climbing, this distance challenges both endurance and climbing ability without the time-management demands of a full ultra. At 55 m of vertical per kilometer, much of the course is runnable — the plan focuses on building your aerobic cruising speed while preparing you for the steeper sections. The official cutoff is 12 hours, so pace management starts from week one. This training plan adapts the 16-week structure specifically for 43.2 km with 2,387 m of elevation gain, scaling weekly volume and vert targets so your body is ready for race-day demands.
This distance sits at the boundary between endurance and speed — long enough to require serious aerobic preparation, but short enough that pace efficiency and descending technique make a real difference. The plan builds weekly volume progressively while including hill-specific sessions to sharpen climbing and descending rhythm.
The 16-week programme is divided into four phases designed around the specific demands of 43.2 km and 2,387 m of climbing:
At 55 m of vertical per kilometer, much of the Marathon du Mont-Blanc 42K course is runnable. Training should emphasise aerobic cruising speed — tempo runs on rolling terrain, sustained effort on moderate climbs, and efficient flat-to-uphill transitions. The biggest risk on a runnable course is starting too fast; practice negative-split long runs to build discipline.