According to the NATA, fluid consuthption and replacement during high temperature training should…

➤ How can athletes monitor and prevent body mass loss exceeding 2% during training?
Weigh athletes before and after sessions in minimal clothing to calculate sweat losses (1 kg ≈ 1 L). Use those values to set drinking plans, schedule fluid intake every 15–20 minutes, and replace electrolytes when needed. Track urine color and adjust hydration strategies to keep net body mass loss below 2%.