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Just came across this exercise suggested for seniors, to build
muscle strength in the arms and shoulders. It seems so easy, I thought I'd pass it on to some of my younger (and older) friends and family.

The article suggested doing it three days a week.

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 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.

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

hank