> ## Documentation Index > Fetch the complete documentation index at: https://docs.saturday.fit/llms.txt > Use this file to discover all available pages before exploring further. # The dials: how Saturday thinks about fueling > The model behind an athlete's fueling plan, and the dials you turn to change it # The dials Saturday does the sports-science math. This section covers the model underneath it, so you can read an athlete's plan, change it deliberately, and answer their questions yourself. To see a live one, open an athlete from your [roster](https://coach.saturday.fit/dashboard). ## How Saturday turns targets into bottles Saturday calculates an athlete's per-hour targets for carbohydrate, sodium and fluid from their profile and the session ahead. It then maps those targets onto the bottles and flasks the athlete carries, producing a bottle-by-bottle, hour-by-hour plan. Three dials shape that mapping, and they all live in one object called the Setup. How targets become real bottles. Which sugars make up the carbohydrate. How far to lean on the kitchen versus branded products. Where all three live, and how you adjust them. ## The short version | Dial | In one line | | -------------------- | ---------------------------------------------------------------------------------- | | Bottling: fill & mix | Which vessels the athlete carries, how big each is, and when they drink. | | Gluc:fruc ratio | The balance of glucose to fructose in the carbohydrate. | | Eco-mode vs products | Whether the kitchen or a branded product fills the gap. | | The Setup | The one object all three live in. Read it, change it, and it syncs to the athlete. | A dial changes *how* a target is met. It does not change the target itself; the per-hour carbohydrate, sodium and fluid numbers come from the athlete's profile and the session. See [Co-piloting](/coaching/overview) for how coach and athlete share control across the portal.