Trail run

RunForestRun Indian Summer Ultra (10th edition)

RunForestRun Indian Summer Ultra (10th edition) took place on Sat, Oct 10, 2026 in Gasselte, Netherlands. The main route is 100 km.

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The 10th-edition Indian Summer Ultra, RunForestRun's long-distance trail from Gasselte through Drenthe's autumn forests. 100 / 75 / 50 km.

This 100-kilometer trail ultramarathon through autumn forests demands sustained cardiovascular endurance and prolonged time-on-feet.

Aerobic Endurance

Covering 100 kilometers on foot requires an exceptionally high volume of steady-state aerobic output and cardiovascular conditioning.

Musculoskeletal Durability

The ultra-distance format subjects joints and connective tissue to continuous impact over many hours of continuous running and walking.

Given the extended duration well beyond 2.5 hours, athletes must ingest 60 to 90 grams of carbohydrates per hour to sustain energy levels.

RunForestRun Indian Summer Ultra (10th edition) took place on Sat, Oct 10, 2026 in Gasselte, Netherlands.

The main route is 100 km.

This 100-kilometer trail ultramarathon through autumn forests demands sustained cardiovascular endurance and prolonged time-on-feet.

RunForestRun Indian Summer Ultra (10th edition) is open to all participants.

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