A good friend has given many face-to-face seminars on the topic of applying improv skills role-playing games. In August 2020 we recorded a talk he gave on this subject, and while focused on RPGs it does provide some good insight to the improv process.

Show notes...
https://docs.google.com/document/d/1KxKYCM7qNzE8sGkkBpGEWY3DIyLYx4pFDGnVkzKZtkM/edit?usp=sharing