The TriMarni Endurance Base Formula is a simple, low-sugar endurance fuel designed for athletes who struggle with cramping, GI distress, bonking, or electrolyte imbalances during long training sessions and races. Built as a flexible foundation for bike fueling, this formula prioritizes digestion, absorption, and hydration—giving athletes steady energy without overwhelming the gut.

Low-Sugar Fuel That Digests Easily

This base formula is intentionally lower in sugar and calories, making it ideal for athletes who don’t tolerate high-carb drinks well. A maltodextrin-forward carbohydrate profile supports smooth gastric emptying and steady energy delivery without spikes or crashes, reducing the risk of GI distress, bloating, or nausea.

Electrolyte-Focused Hydration Support

Formulated with a robust but balanced electrolyte profile, this blend helps combat cramping, lightheadedness, and dehydration—especially for athletes prone to high sweat losses or hyponatremia. It provides the sodium and minerals needed to maintain hydration without relying on excess calories or sugar.

No Caffeine, No Overstimulation

This formula contains no added caffeine, making it ideal for athletes sensitive to stimulants or those who prefer to control caffeine intake separately. The absence of caffeine also makes it well-suited for long training days, hot conditions, or fueling strategies where gut comfort is the top priority.

Built for Long Bike Sessions & Flexible Fueling

Designed primarily for bike fueling during longer training and racing, the TriMarni Endurance Base Formula can be used as a standalone low-calorie liquid fuel or paired with solid foods as needed. Athletes can easily increase calories by adjusting scoop concentration or supplementing with food, making this an adaptable foundation for a wide range of fueling strategies.

Simple, Sustainable Flavor Profile

Lightly flavored and not overly sweet, this formula is designed to remain palatable for hours on end—helping prevent taste bud fatigue during long rides. Many athletes rotate flavors in training and racing to keep fueling enjoyable and consistent.

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

The TriMarni Endurance Base Formula was developed by Marni Sumbal, Board Certified Sports Dietitian and 11x Ironman finisher, including 4 Ironman World Championship finishes. With decades of experience helping endurance athletes simplify