[Paddlewise] Conditioning routine?

I'm living in Northern Wisconsin.  At the end of August it has become  
apparent that an early May start does not get me in condition fast enough for a  
long summer trip, when the schedule only allows me to paddle a couple of hours  
once or twice a week.
 
Any suggestions for a good conditioning routine for the off season and off  
days?  I have not sen any good books on the subject.
 
 
Thanks
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