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, and 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 sacks.
Then try 50-lb potato sacks and then eventually try to get to where you can lift a 100-lb potato sack in each hand and hold your arms straight for more than a full minute. (I´m at this level.)
After you feel confident at that level, put a potato in each of the sacks.
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