A friend came across this exercise suggested for seniors, to build muscle strength in the arms and shoulders. It's so easy and since many of us are getting to that point in our lives, I thought I'd pass it on.
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 will find that you can hold that position for just a bit longer. After a couple of weeks, move up to 10-lb potato sacks, then 50-lb potato sacks and eventually try to get to where you can lift a 100-lb potato sack in each hand and hold your arms straight for a full minute.
Once you feel confident at this level, put a potato in each sack.
Ha Ha, Doug DaCosta