Like multitudes of middle-class American suburbanites have in recent months, Kim Holderness looked out her window in Raleigh, North Carolina, earlier this year and chuckled at what she saw: “Just a parade of middle-aged men and women wearing weighted vests walking by. Almost like an army,” Holderness, 49, remembers. “I was like, ‘Holy s---. It’s not just me.’” Unlike all those multitudes, she promptly sat down with her husband, Penn Holderness, and got to work writing and choreographing a song a 
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