Runners: ever wanted to give your brain a workout on run day? Last week, runner and content creator Nick Flint of Tampa, Fla., did just that–combining his daily New York Times (NYT) Mini crossword with a 400m sprint. The result? A genius hybrid challenge that mixes speed, smarts and friendly rivalry.

Government agency abbreviations and the Times Crossword go together like socks and feet. Also, like socks themselves. The [Situation Room grp.] is the N.S.C., short for National Security Council. In another puzzle,