What is a common indicator of muscle fatigue in athletes during training sessions?

Decreased performance is a common indicator of muscle fatigue during training sessions for athletes. As an athlete continues to exert themselves, the muscles can become fatigued, leading to a reduction in strength, power, and overall performance. This can manifest as an inability to maintain previous performance levels, reduced ability to lift weights, slower response times, or decreased endurance capabilities.

In contrast, increased endurance, rapid recovery, and enhanced flexibility are generally associated with positive improvements in training rather than signs of fatigue. Increased endurance suggests that an athlete is becoming more conditioned, while rapid recovery indicates that the body is efficiently returning to a resting state after exertion. Enhanced flexibility implies that the muscles and joints are becoming more adaptable and are often a byproduct of regular training and stretching practices. Thus, decreased performance stands out as the clear indicator of muscle fatigue.