My endurance train sustain is an effective performance boosting drink designed to be taken during training raising energy levels and increasing stamina ndash helping to maximise training performancer the my endurance train sustain formula provides hardworking muscles with quality carbohydrates delivering 41g carbohydrates per serving designed to fuel muscles with energy powering you through the toughest of training sessionsr while high strength bcaas including 250mg l isoleucine 250mg