Begin by standing on a comfortable surface, where you have plenty of
room at each side. With a 5-LB. potato sack in each hand, extend your
arms straight out from your sides, and hold them there as long as you
can. Try to reach a full minute, then relax.
 
  Each day, you'll find that you can hold this position for just a bit
longer. After a couple of weeks, move up to 10-LB. potato sack.
 
  Then 50-lb. potato sacks, and eventually try to get to where you can
lift 100-lb. potato sack in each hand and hold your arms straight for
more than a full minute.

 

  After you feel confident at that level, put a potato in each of the
sacks. 

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