Which of the following statements best refers to the impact of temperature on exercise intensity?

Higher intensity can be maintained in cooler water because cooler temperatures provide a more favorable environment for the body to perform physical activity. When exercising in cooler water, the body is less prone to overheating, which means that individuals can sustain a higher level of intensity for a longer duration without experiencing fatigue or exhaustion. Cooler temperatures help regulate body temperature, allowing for improved cardiovascular performance and increased endurance.

In contrast, as exercise intensity increases, the body's demand for cooling through sweat becomes more vital. In hot conditions, the body may struggle to keep temperature down, resulting in diminished performance. Thus, cooler water significantly contributes to maintaining exercise intensity effectively.

Other options do not accurately reflect the relationship between temperature and exercise performance. Warmer water is not conducive to sustained high-intensity exercise due to the increased risk of overheating, and muscle stiffness or flexibility are not directly correlated with temperature in the way the statements suggest.