I thought I would let my friends in on a little secret I've found for building my arm and shoulder muscles. You might wish to adopt this regimen.
Three days a week works well.
I start by standing outside behind the house and, with a five-pound potato sack in each hand, extend my arms straight out to my sides and hold them there as long as I can.
After a few weeks I moved up to 10-pound potato sacks, then 50-pound potato sacks, and finally I got to where I could lift a 100-pound potato sack in each hand and hold my arms straight out for more than a full minute.
Next, I started putting a few potatoes in the sacks, but I would caution you not to overdo it at this level.
