Explain the role of electrolytes in hydration for [ATHLETES/BEGINNERS/ELDERLY] engaging in [HIGH-INTENSITY WORKOUTS/MODERATE EXERCISE/DAILY ACTIVITIES]. Detail how [SODIUM/POTASSIUM/MAGNESIUM] specifically impacts fluid balance, muscle function, and recovery. Provide [SCIENTIFIC REFERENCES/PRACTICAL TIPS/CASE STUDIES] to support your explanation. Be concise yet thorough, addressing common misconceptions like [ELECTROLYTE DRINKS VS. WATER/OVERHYDRATION RISKS/TIMING OF INTAKE].