Nimble. Graceful. Rhythmic. None of these words come to mind when we think about Andy Richter. Yet the pudgy former late-night sidekick is beguiling viewers on the 34th season of “Dancing with the Stars.”

Go figure.

Richter’s appeal is amply established, but statistically speaking, few expected the confessed dance avoidant to make it this far. At 59, he is decades older than many of his fellow contestants and so far has outlasted members of Fifth Harmony and Pentatonix; an NBA all-star; Alec Baldwin’s physically and culturally flexible wife, Hilaria; and, as of last week, Jen Affleck of “The Secret Lives of Mormon Wives.”

Viewers responded to his “DWTS” debut by voicing their concern on social media that he might suffer a heart attack live onstage, which is unkind, but he handled it in

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