Begin warm up by standing on a comfortable surface, where you have plenty of room at each side.
With a 5-pound 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-pound potato sacks.
Then try 50-pound potato sacks, and then eventually try to get to where you can lift 100-pound potato sacks 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 sack.

Of all the mistakes of my youth the one I regret the most was not buying stock in Lady Clairol. With the amount of color I buy, they will never go out of business!
Gotta go see how big my potato sack is. Don’t want to injure myself the first day in training!
Lisa
http://www.lisasdowning.com