Which of the following are common signs of overtraining?

B is the correct answer because increased injuries and mood swings are well-established signs of overtraining. When an individual is overtraining, the body is subjected to excessive stress without adequate recovery, leading to physical and psychological symptoms. Increased injuries may occur as the body becomes fatigued and less able to handle the rigors of training, resulting in a higher risk of strains, sprains, and other injuries. Mood swings can arise due to hormonal imbalances and fatigue, affecting overall mental well-being.

In contrast, options that suggest improved performance and energy, heightened motivation, and better recovery times are generally indicative of a well-managed training program rather than overtraining. When a person is truly overtraining, they typically experience fatigue, lack of motivation, and prolonged recovery times, all of which contradict the benefits highlighted in those other choices.