There are some fundamentals of yin and yang in training that must be observed. Hard work must be balanced by easy work. Increase a load in one area and you must decrease a load in another area. Essentially go back to high school biology, to the most fundamental principle you learned – Homeostasis. Essentially the body will always seek a state of Homeostasis. As coaches through training we are constantly working to adjust that state to a higher level, it is no more complicated than that. To achieve adaptation you must constantly be aware of the yin and yang of all the elements of training. Keep the elements in balance; do not overemphasize one element to the exclusion of another. Good training design is a balancing act to insure continual adaptation to the various training stimuli.