Marathon electrolytes: plan your drinks, fuel and aid stations

Plan by time between aid stations

Check the current event information for water stops, supplied drinks and carrying rules. Distance alone does not show how long you will be without a drink: use your expected pace to understand the gaps. A plan copied from a faster runner may not fit your race.

If using an on-course drink, check its serving information rather than assuming it matches your own powder. Have a simple fallback for a missed station or an unavailable flavour.

Test fluid, sodium and carbohydrate together

Electrolytes supply minerals; they do not automatically cover marathon fuel needs. Count what comes from drinks, gels and food separately. Try the full combination on long runs at relevant paces, including opening packets and drinking while moving.

Use one session to assess the bottle and flavour, then another to test the drink alongside fuel. Changing only a few things makes discomfort easier to interpret. Race morning is a poor time to experiment with a concentrated mixture.

Give each product a clear place

Use thirst alongside your practised individual plan and adjust to conditions. Do not force a drink at every table just because it is available. Sodium does not prevent the consequences of overdrinking.

If choosing BreathersBliss, decide where its one daily stick fits: before, during or after, based on practice. A stick each hour or at every station would exceed the product directions. A wider endurance nutrition requirement needs a wider plan, not extra servings by default.

Know when to stop improvising

Late-race cramp does not prove sodium deficiency, and nausea is not a reason to force more salty fluid. Slow down when needed and seek the medical team for confusion, collapse or significant symptoms. After finishing, return to drinks and food gradually rather than trying to solve everything with one large bottle.

Common questions