From the LSA Inclusive Teaching Initiative, University of Michigan:

• "There will be students who believe they already have a growth mindset, and they might think the activities are not a good use of their time.
• It is less effective, and potentially detrimental, to simply tell students to change from a fixed mindset to a growth mindset, or to simply tell them to work hard. It is more effective and important to explain why they should work hard."

There are two different writing assignments included in the activity instructions. The facilitator can choose which one they prefer.

There is also a version of this activity for middle school students in Links.