Alfredson's Law states that the effectiveness of a training program is determined by the balance between the intensity of the training and the athlete's ability to recover. If the training intensity exceeds the athlete's recovery capacity, it can lead to overtraining and injuries. This principle emphasizes the importance of listening to one's body and adjusting training loads accordingly. Athletes and coaches should monitor recovery and adapt their training plans to ensure optimal performance while minimizing the risk of burnout or injury.