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 sacks.
Then move up to 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 now.)
After you feel confident at that level, put one potato in each sack.
____________________ If you can't read this, you're illiterate.