Advertising items are somewhat common, and yardsticks used to be a very standard advertising item.
Weight loss groups are mainly geared towards women, as are sewing groups, so maybe there was some sort of women/sewing/measuring tool type thinking when the item was chosen.
There are **** measure for measuring body dimensions and a person’s Body Mass Index, which I mainly know about because there is a German Measuring Tool manufacturer that goes by BMI ( Bayerische Maßindustrie ) and internet searches used to routinely come up with the BMI (Body Mass Index) tape measures.
An accordion folding rule, like the Lufkin style, might be more preferable for measuring height then a compact tape measure would be, although a flexible tape like that used for sewing would be better for measuring things like waist dimensions.
Maybe the weight loss group had already bought flexible tapes for everyone, and opted for folding rules as gifts?
I should probably mention that BMI manufactures the accordion style folding rules, in beech wood, fiberglass, and aluminum versions.
I also found some BMI marked stainless steel versions years ago, but don’t know if those were actually made by BMI or just rebranded.
The mat stainless version was my favorite as a compact meter stick.
Fiberglass versions are sometimes sold for use were insulated tools are required, and I think Wiha sells a Swiss made version that is actually 1000v certified.
www.bmi.de
Hultafors of Sweden manufactures beech wood, fiberglass, and aluminum accordion folding rules.
Our range includes several models of wooden, fibreglass and aluminium folding rules. Contact-meter and 2.4 m folding rule are two popular models.
www.hultafors.com
For the old fashioned Stanley type folding rules, I think plastic versions are still made.
There were English made wood versions maybe 20 years ago, but quality wasn’t great.
Stanley and Lufkin/Crescent both sell the plastic four fold rules, but possibly not in the USA.