run/jog. 
excellent for endurance, and if you start now, and keep to a good program that works for you, you will be very happy with the results. 
speaking from experience 

 
		
		
		
		
		
			
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Therell be days/When Ill stray/I may appear to be/Constantly out of reach/I give in to sin/Because I like to practise what I preach