This is working well for those of us getting along in years. Here is a little secret for building your arm and shoulder muscles. You might want to try doing this three times a week.Begin by standing straight, 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 last a full minute.

Relax. After a few weeks, move up to 10 lb. potato sacks then, as you progress, 20-lb. potato sacks, and eventually try to get to where you can lift a 50-lb. potato sack in each hand and hold your arms straight out for at least a full minute.After you feel confident at that level, start putting a couple of potatoes in each bag.