Also known as the principle of progressive lifting of the load, the principle of overload is related to the adaptations suffered by the organism as a result of the training stimuli (physical effort). In this principle there is a regular and progressive increase of the (total) exercise load that will allow the desired improvement of performance. Based on this principle, Anthony struggled to lift heavier weights than the weights he was lifting. This is because it is progressively increasing the exercise load. For that reason, he felt good, but his muscles were sore because they were not used to this weight.
Progression. once you move up your muscles will be sore since they arent used to it- but you do that until it doesnt make you sore and then move up again to progress.
