Which of the following is NOT an early warning sign of overtraining?

Increased water consumption during training is not typically considered an early warning sign of overtraining. While hydration is essential for optimal performance and recovery, an increase in water consumption during exercise may simply reflect a greater effort or environmental factors, such as heat or humidity. It does not inherently indicate that an athlete is experiencing overtraining.

In contrast, fatigue during workouts, increased heart rate, and sleep disturbances are recognized symptoms associated with overtraining syndrome. Fatigue can manifest as a reduced ability to perform workouts effectively, and an increased resting heart rate is often a physiological response to excessive training without adequate recovery. Sleep disturbances can further contribute to feelings of fatigue and hinder recovery, exacerbating the negative impact of overtraining. Understanding these specific symptoms can aid in identifying when an athlete may need to adjust their training regimen.