The strain placed on the body through exercise or arduous physical work varies from person to person. Of course, regular endurance training, for instance when preparing to run a marathon, implies nutritional requirements that greatly differ from those of the occasional 30 minute run.   The question about the requirement of Energy System for the very individual use is legitimate and therefore warranted.  The choice of an adequate dietary supplement not only depends on the intensity of the workout, but is further determined by your personal ambitions. A competing athlete, for instance, requires more dietary supplements than a recreational athlete whose primary objective is to burn fat. Ambitious endurance athletes will benefit from the complete range of the Energy System product line.   Consisting of Isotonic Perform Drink, Perform Bar, Perform Gel and Recovery Drink, Energy System is the perfect training companion. It provides an optimal supply of fast and slow carbohydrates and thus prevents a drop in your performance even during long endurance runs of several hours.  Performance-oriented athletes rely on adequate dietary supplements. For hobby athletes, the Energy System product line is first and foremost an aid. Energy System products should mostly be used when your daily food intake does not provide a sufficient supply of energy and minerals. An endurance workout of less than 45 minutes does not necessarily need to be complemented with drinks or gels. But it still requires a sufficient supply of the body with energy prior to training. Energy is the prerequisite for a training unit. Without energy, the body tires quickly, and as a result, the training is no longer fun. Furthermore, fat is mostly burned in a carbohydrate flame (explanation). A serving of Isotonic Perform Drink or a Perform Bar is the ideal snack prior to training. Unhealthy chocolate bars should be replaced by Energy System Perform Bars. Etc.   Nutrient relation in endurance sports according to scientific studies: the nutrient relation in endurance sports should be as follows: 60% carbohydrates 12-16% protein 24-26% fat.  For extreme endurance performance, the carbohydrate percentage may be increased to up to 80%. Protein or amino acids are essential for the regeneration phase.