What is the principle of adaptation?

The principle of adaptation refers to the process of the body getting accustomed to a particular exercise or training program through repeated exposure. As the body adapts to the stress of the new exercise or training program, the program becomes easier to perform and explains why beginning exercisers are often sore after starting a new routine, but, after doing the same exercise for weeks and months at the same intensity, the exerciser experiences little, if any, muscle soreness. This reinforces the need to constantly vary the exercise and training routine if you want to maximize your results.