Christina has a wealth of resources on her website: missphysicaleducation.com and one of them is a great list of Growth Mindset questions: https://goo.gl/HyfoHa
She suggested using this in an "Active Walk" or as we might call it, here in the US, a "Walk and Talk". I was thinking that you could combine the questions with a projector and the use of the Random Name Picker from Classtools to randomly pick the questions. So... here it is: https://www.classtools.net/random-name-picker/49_P2eBYg
The text is a bit small when you get the result because of the length of the questions, but if you hold down "Ctrl" and click "+" you can zoom it up. I suggest 150%. One of the best things about using this spinner is that you can remove a question after it comes up so, no repeats. If you bookmark the spinner, you can use over and over throughout the year after any activity.