Mike Brown might be barking “turn on the motherfu—– jets,” but this season, the only thing sprinting is his mind.

The Knicks ’ new head coach, known for going viral during his Sacramento tenure for sprinting (and cursing) in practice, is taking a different approach in New York. Back then, it was part performance, part principle — a fiery demonstration meant to turn the Kings into the league’s fastest-paced team by leading from the front.

“You know, that was just dumb. It was dumb first of all. It was just a spur-of-the-moment thing. Both of my hammy’s could have been gone. Both of my Achilles could have been gone. I’m conscious of that,” Brown said with a laugh after Day 2 of Knicks training camp in Tarrytown on Thursday. “I’m 55. I know if I’m going to do something — just like this pr

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