People with disabilities, elder people,  public retired people,  pensions, veterans people.
        
             
        
        
        
True I guess is the answer 
        
             
        
        
        
Answer i dont really know thats a very good question
        
             
        
        
        
Progression. A principle that refers to the gradual increase in the amount of exercise or overload sustained over a specified period of time Recovery Heart Rate.