Which of the following is not a symptom of overtraining?

Muscle hypertrophy refers to the growth and increase of the size of muscle cells, which typically occurs as a result of consistent and effective strength training combined with adequate nutrition and recovery. It signifies physiological adaptation to training rather than a symptom of overtraining.

Overtraining is characterized by a range of negative symptoms that arise due to excessive exercise without sufficient recovery, leading to decreased performance and overall health. Elevated resting heart rate, poor quality training sessions, and sore and stiff muscles are all indicators that a person may be experiencing overtraining. These symptoms reflect the body’s stress response and its struggle to cope with the high levels of activity. In contrast, muscle hypertrophy represents a positive adaptation, showing that the body is effectively responding to training stimuli. Thus, it is clear why muscle hypertrophy does not fit as a symptom of overtraining.