LAST YEAR, I WATCHED HALLE RUSHOLT coach an engaged couple through their third lesson at Extreme Dancesport, her studio in Cambridge. Paul Fombelle, the husband-to-be, was clean-cut and self-deprecating, but not overly so. His partner, Gina Poppe, was statuesque, a little shy, and laughed at Paul’s jokes. As the Avett Brothers’ “Swept Away” played on the speaker system, Halle peppered the two with dance instructions that, it struck me, were also lessons for a successful marriage.
“You’ve got to fully commit to the movement,” she said at one point.