I only played during PE lessons but don’t recall anyone ever referring to measurements during play. Just “the box” or the “halfway line”.
I would believe that there's some standardization from NAFTA and similar agreements with our northern (and southern) neighbors. But I think Canada's usage of the Metric (and Imperial) systems has more to do with being part of the commonwealth and less to do with the US being nearby.
https://www.packaginglaw.com/ask-an-attorney/are-both-imperi...
"Labels on packaged food regulated by the Food and Drug Administration (FDA) must provide the statement of quantity in both metric terms (grams, kilograms, milliliters, liters) and U.S. Customary System terms (ounces, pounds, fluid ounces). For meat, poultry, and poultry products, which are regulated by the United States Department of Agriculture (USDA), the statement of quantity need only be expressed in U.S. Customary System terms. The use of metric measurement is voluntary because the Fair Packaging and Labeling Act (FPLA), which regulates labeling of consumer commodities, exempts meat and poultry products from metric statement requirements. (See 15 USC 1459(a)(1)."
