Key facts
- Key electrolytes: sodium, potassium, magnesium, calcium.
- Lost through sweat during exercise.
- Essential for muscle contraction and fluid balance.
- Important to replace during long or sweaty sessions.
Electrolytes are minerals that carry an electrical charge and keep your body's signaling running — they drive nerve impulses, muscle contractions, and the movement of fluid in and out of cells. Sodium and potassium are the heavy lifters for hydration and muscle function.
You lose electrolytes (especially sodium) through sweat, so long, hot, or intense training can deplete them and contribute to cramping, fatigue, and poor hydration. For everyday activity a normal diet covers your needs, but around heavy sweating, replacing fluids together with electrolytes maintains balance and performance better than water alone.
Frequently asked questions
When do I need electrolytes?
Mainly during long, hot, or very sweaty training. For typical daily activity, a balanced diet provides enough electrolytes without supplementation.
Do electrolytes prevent muscle cramps?
They can help. Cramping has several causes, but sodium and fluid loss is a common contributor, so replacing electrolytes during heavy sweating may reduce it.
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