Hydration needs during different exercise intensities are influenced by factors like duration, environmental conditions, and individual sweat rates. During high-intensity workouts, the body loses fluids rapidly through sweat, requiring prompt replenishment to maintain performance and prevent dehydration. Additionally, aerobic exercises generally lead to more significant fluid loss compared to resistance training. It is essential for athletes to monitor their hydration status and drink fluids before, during, and after exercise, adjusting intake based on factors such as heat and exertion levels.