The document discusses principles of endurance training and different endurance training techniques. It states that athletes should construct their own training regimens based on an understanding of sound training principles rather than copying other athletes. Factors like VO2 max, lactate threshold, and exercise economy impact endurance performance and should be considered when planning training. Effective endurance training programs follow principles of selecting the right exercise mode, frequency, intensity, duration, and progression. Interval training, fartlek training, and circuit training are described as specific endurance techniques.