What are the primary effects of excessive sweating during exercise?

Excessive sweating during exercise primarily leads to dehydration, loss of electrolytes, hyperthermia, and can, in extreme cases, result in death. When the body sweats excessively, it loses not only water but essential electrolytes such as sodium, potassium, and magnesium. This loss can disrupt the balance of fluids in the body, leading to dehydration, which impairs performance, decreases endurance, and can lead to complications like heat stress or heat stroke.

Hyperthermia, or overheating, occurs when the body cannot efficiently dissipate heat, often exacerbated by excessive fluid loss. In severe scenarios, continued dehydration and an inability to regulate body temperature can escalate to dangerous conditions, including organ failure or death.

The other options present benefits or outcomes that are not typically associated with excessive sweating. For example, while improved circulation and cardiovascular function are beneficial outcomes of exercise, they are not direct effects of excessive sweating. Likewise, enhanced muscle recovery and electrolyte balance would be more aligned with proper hydration and nutrition, rather than the depletion caused by excessive sweating. Thus, "B" accurately captures the serious risks associated with excessive sweating during exercise.