We all know that sports are tiring. They require increased amount of energy to complete (and compete in). It doesn’t matter if you are a swimmer, competitive lifter, football player, tennis player, martial artist or baseball player, your body needs specific amounts of nutrients to fuel your game. Depending on what you do, you may require more carbohydrates than another athlete. If you lift heavy, perhaps you are needing more protein to build muscles for a show. Every sport will have different nutritional needs based on the demands of that sport. On top of that, every athlete within the same sport will require different nutritional needs based on their own bodies. It keeps going. Different genders will have different needs as well as different ages. We can’t train an experienced athlete the same as a 13 year old beginner, obviously. However, the differences between 13 year olds and 15 year olds are important to take into consideration when programming.