XTEND Endurance combines the BCAA's, glutamine, citrulline malate, and electrolytes in original XTEND with a novel carbohydrate blend to fuel muscles and replace lost glycogen stores. XTEND Endurance is perfect for MMA athletes, Cross Fitters, Tough Mudders, triathletes, cyclists, and anyone who is into long distance, multiple workouts, or sustained high intensity effort.