Gut Training Ride: Progressive High-Carb Intake Session

Session Overview

A long, steady outdoor ride built specifically to train your gut to handle higher carbohydrate intake, using a stepped fuelling schedule rather than fuelling “by feel”. Best used as a rehearsal for long-course race nutrition, ideally with the exact products you plan to use on race day.

What You’ll Need

• 2-3 bottles of a glucose-fructose energy drink mix
• 3-4 energy gels (glucose-fructose blend if racing long-course)
• A bike computer or watch with a lap/interval timer
• A quiet-traffic route or turbo trainer if riding indoors

Warm-Up (15 minutes)

Easy zone 1-2 spinning, building gradually to steady zone 2 effort by the end of the warm-up. Take your first sips of drink mix during this block so fuelling starts early rather than after you’re already thirsty.

Main Set (2.5-3 hours, steady zone 2)

Ride at a consistent, conversational zone 2 effort throughout — this isn’t an intensity session, so don’t let fuelling nerves make you ride harder or easier than planned. Follow a stepped carb intake schedule across the ride:

• Hour 1: target 60g of carbohydrate — roughly one bottle of drink mix plus a gel, spread evenly rather than front- or back-loaded
• Hour 2: step up to 75-90g — add a second gel or a slightly stronger drink mix concentration
• Hour 3 onward: if hour 2 felt comfortable, push to your race-target intake (90-120g for most long-course athletes); if it didn’t, hold at hour 2’s level instead

Take fuel on a fixed schedule — every 15-20 minutes — rather than waiting until you feel low on energy, which is already too late to test genuine gut tolerance.

Cool-Down (10 minutes)

Ease back to zone 1 for the final 10 minutes. Stop fuelling once you drop out of the main set — this isn’t about total calories, it’s about training your gut’s absorption rate under load.

Coaching Notes

• If you feel bloated, sloshing or nauseous, drop back to the previous hour’s intake level rather than pushing through — the point is controlled progression, not surviving discomfort
• Repeat this session weekly or fortnightly, increasing your target intake by 10-15g/hour each time you complete one comfortably
• Always use the exact gels and drink mix you plan to race with — gut training on a different product doesn’t reliably transfer to race day
• Scaling down: shorten to 90 minutes total with a single fuelling step if you’re new to structured carb intake or returning from a break

Read the full guide: Gut Training for Triathlon: How to Build High-Carb Fuelling Tolerance