So, I have been using the Elliptical for quite some time.  Knees are beyond decrepit.  About two weeks ago, I decided to switch over to the treadmill.  After building up to it, I ran today for six miles.  I did an average of an 8.5 min mile.  Not too bad
	
		
			
		
		
	
								 
					
						 
					
					
				 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		