A gradual and systematic increase in the stress or demand placed on a physiological system or organ to avoid the risk of chronic fatigue or injury.
This process necessitates a gradual increase in the stress placed on the body during training. Without these additional demands, the human body has no reason to adapt any further than the current level of fitness.
Progressive overload is a gradual increase in physical activity to stress a muscle group or body system beyond accustomed levels. Gradual adaptation occurs, resulting in improved physiological functioning. The FTI order of overload and 10 percent increase per week rules should be followed to overload correctly.