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Progressive overload is known as a gradual increase in stress being applied to the body during exercise. This occurs via small increases to one of the following factors; volume (weight/length of training), frequency (how often the training is performed) and intensity (how hard the training is).

SOURCE:

https://www.beyondfitnesshealth.com.au/fitness/fundamentals-of-progressive-overload/#:~:text=Progressive%20overload%20is%20known%20as,how%20hard%20the%20training%20is).