Carry-and-tolerate guide
Trail Runner
Nutrition
Trail athletes need earlier fueling, more pack planning, and a system that matches terrain, altitude, and time on feet.
Fuel earlyPackSodiumTerrain
Use this trail rule
Start feeding early, pack a real backup, and rehearse trail fuel on the same terrain where it has to work.
Trail reminders
Start feeding before the bonk.
Pack extra fuel and one backup item every time.
Road-run tolerance does not guarantee trail tolerance.
Next action
Plan the next long trail run with an hourly fuel target, a sodium source, and one emergency backup food before leaving the trailhead.
Trail fueling rewards the athlete who plans for time, terrain, and carrying logistics.