Electrolyte Replacements by Science in Sport. Details: Very low in calorie content, yet high in sodium content to provide optimum hydration for intense competition, training or recreation in the heat. The Go Hydro tablets will aid athletes with extreme hydration needs or those on calorie controlled diets, or with specific weight restrictions and targets. Uses include low-intensity sports, recreational sports (where a food break is included in the day, eg: family walks), sports such as sailing where there may be long periods of relative inactivity, activities undertaking whilst on a calorie-controlled diet, etc.