Reliable indicators of hydration status include monitoring urine color, thirst level, and body weight. Clear or light yellow urine typically signals good hydration, whereas dark urine may indicate dehydration. Regularly assessing thirst can provide additional insight, as persistent thirst may be a warning sign. Body weight changes before and after exercise can also reveal fluid loss; a drop in weight may necessitate increased fluid intake. Combining these indicators can help maintain optimal hydration levels.