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