The Joint Consortium for School Health has published the Positive Mental Health Toolkit as a free resource for educators, with five brief but informative modules. You can also access their free publication: Schools as a Setting for Promoting Positive Mental Health: Better Practices and Perspectives.
Additionally, the Ontario Ministry of Education has created the K-12 resource Supporting Minds: An Educator’s Guide to Promoting Students’ Mental Health and Well-being.
School Mental Health Ontario offers a wide variety of easy to implement strategies for the K-8 classroom here.
Additionally, pages 25-27 of the Ontario curriculum document Foundations for a Healthy School Resource address Mental Health in the classroom.
Mindfulness Practices for the Classroom
Video resources on mindfulness (including full-length lessons) are available here, and “51 Mindfulness Exercises for Kids in the Classroom” is available here.