The following resources provide useful exercises and activities for helping our students (and us) relieve anxiety and stress. Many of them can work as well online/remotely as they do in person.
Mindfulness and Meditation on Campus
https://www.affordablecollegesonline.org/college-resource-center/mindfulness-meditation/
22 Mindfulness Exercises, Techniques and Activities for Adults
https://positivepsychology.com/mindfulness-exercises-techniques-activities/
Mindfulness in the Classroom
https://cft.vanderbilt.edu/guides-sub-pages/contemplative-pedagogy/#activities
Mindfulness in the Classroom: Exercises for Your Students to Focus on Class Content
This material is rather basic, but it could serve as an introduction for students to these concepts.