The TriMarni Endurance Formula is a simplified, gut-friendly fueling solution designed to help endurance athletes stay energized, hydrated, and focused during long training sessions and races. Built to reduce GI distress, stabilize energy, and eliminate overcomplicated fueling strategies, this formula supports consistent performance for athletes of all genders, sizes, and experience levels—especially during half and full-distance triathlon efforts.

Stable Energy Without GI Distress

This formula uses a high proportion of carbohydrates from maltodextrin, delivering steady energy with optimal osmolality to support proper gastric emptying. The result is fuel that digests smoothly, helping reduce bloating, sloshing, bonking, and lightheadedness during long rides and runs.

Optimized Hydration & Electrolyte Support

A balanced electrolyte profile supports hydration needs for most endurance athletes without overwhelming the gut. This helps reduce the risk of cramping and dehydration while maintaining performance across long, demanding efforts.

Light Caffeine & Mental Focus Support

Each serving contains ~50mg of caffeine to help lower perceived effort and improve focus—ideal for long training days and race scenarios. For athletes sensitive to caffeine, this can easily be removed using the caffeine slider. Added amino acids (~1g per serving) support mental clarity and help combat brain fatigue late in workouts.

Flavor Designed for the Long Haul

Lightly sweet and easy to drink, the TriMarni Endurance Formula is designed to stay palatable hour after hour—crucial when fueling for 56 or 112 miles on the bike. Many athletes rotate 2–3 flavors to prevent taste fatigue during training and on race day.

Built for Bike-to-Run Success

When consumed consistently (2–4 swallows every 10–15 minutes), this formula supports smooth fueling on the bike with minimal GI carryover into the run. It’s especially well-suited for half and full Ironman training and racing.

About the Coach: Marni Sumbal, MS, RD, CSSD

The TriMarni Endurance Formula was developed by Marni Sumbal, a Board Certified Sports Dietitian and 10x Ironman finisher, including 4 Ironman World Championship finishes. With decades of experience working with endurance athletes, Marni believes fueling should be effective—not complicated. This formula reflects her philosophy: simple, science-backed nutrition that works for men and women of all ages, sizes, and fitness levels.