Geeknamese
Explorer
No, because it's unnecessary and intimidating. Roleplaying is not acting, it is putting yourself in the shoes of your character in the gameworld and making decisions. Interacting with NPCs does not require a performance, a player can quite adequately describe what their character does in the third person:
"My character takes offense at those words and grumbles about the rudeness"
It's great if the players want to animate their characters through performance, but it is absolutely not essential to playing the game.
I think you may be missing the point of what improv classes are. It's not about perfecting your performance or playing a character, etc. That's what regular acting classes are for. Improv classes are for learning how to think on the fly, flow with the scene, riff off what is happening at the present moment and letting go and taking chances. Improv classes would help any player or DM improve with D&D.
I agree with most that improv classes shouldn't be mentioned as a requirement or suggestion to better DMing but there should be improv tips, as iserith, suggested which could enhance play.
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