The principle of progressive overload is described by an improvement in physical fitness which requires a gradual increase in physical activity and working the body beyond accustomed levels.

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Yes, the statement is true. The principle of progressive overload is a concept in fitness training that involves gradually increasing the intensity, duration, or frequency of exercise in order to continually challenge the body and promote ongoing improvement in physical fitness. By progressively increasing the demands placed on the body, such as lifting heavier weights, running longer distances, or doing more repetitions, the body is forced to adapt and become stronger, faster, or more flexible over time. This principle is commonly applied in resistance training, cardiovascular exercises, and flexibility training, and is an important aspect of designing effective workout programs.