About sis go isotonic gels the sis go isotonic gel was the worlds first isotonic gel effectively delivering an easily digestible and quick supply of carbohydrate for energy during exercise sis go gels are designed to be consumed without water meaning that you can ensure rapid delivery of carbohydrate to your muscles without the feelings of being bloated that can sometimes occur with over drinking why should i take this gel depleting your carbohydrate stores during exercise is one of the majo