1. physical stress 2. plateau a principle stating that the results you get will be directly related to the type of work you do and to specific muscles or body parts being worked a principle that refers to the gradual increase in the amount of exercise sustained over a specified period of time how quickly your heart rate returns to normal after an activity session a term used to describe the workload placed on the body in general an element of fitness that is 3. progression 4. recovery heart rate 5. specificity characterized by a decrease in improvement or a leveling off of performance 6. Stamina the ability to sustain a workload for an extended period of time states that the body adapts to 7. the overload principle increasing demand by developing the ability to handle those specific demands