John Caling sent me the following email. Given that the Guyra Lamb and Potato Festival has just concluded, it somehow seemed appropriate to included this here. John wrote I have tried this and it isn’t a hard as it seems – give it a go.
This seems a little daunting to start with, but if you apply yourself you may find that it's not as difficult as you think.
Begin by standing on a comfortable surface, where you have plenty of room at each side.
With a 5-kg 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, and 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-kg potato sacks.
Then try 25-kg potato sacks and then eventually try to get to where you can lift a 50-kg potato sack in each hand and hold your arms straight for more than a full minute. (I'm at this level.)
After you feel confident at that level, put a potato in each sack!