He emphasized the need to maintain perfectly strict form, move the weights in a slow and controlled manner, work the muscles to complete failure (positive and negative), and avoid overtraining.
Athletes who experience burnout may have different contributing factors, but the more frequent reasons include perfectionism, boredom, injuries, excessive pressure, and overtraining.
Overtraining is the decline in training performance over the course of a training program, often increasing the risk of illness or injury or decreased desire to exercise.