Robert F. Kennedy Jr. doing pull-ups at DCA airport is not exactly the kind of air travel improvement travelers want this holiday season. | Heather Diehl/Getty Images This month, a video of Robert F. Kennedy Jr. popped up on my feed. Wearing a blue dress shirt and tie, the bronzed, tin-voiced secretary of the US Department of Health and Human Services began doing pull-ups. While videos of septuagenarians doing body-weight might be rare if not odd, performing exercises on film has sort of become Kennedy’s modus operandi. Watching this man, who was born in 1954, push and pull his body in...

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