Rob Walter and his wife Lyn live in Fort Worth, Tex. Every Saturday, they attend 10 a.m. kettlebell classes, which their fitness instructor Ryan Shanahan conducts out of his Toronto home.

Despite the 2,000-odd kilometres between the two cities, the Walters have an easy commute; they only have to make it as far as their living room, where they are joined online by as many as 25 other students from North America, South Africa, Germany and Scotland. T……

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