Journaling is widely regarded as one way to improve mental health, as writing and reading about our feelings and events help us to process the emotions behind them. And because the activity is valuable for any age capable of reading and writing, it's a simple activity we can all share.
Because generating the ideas or what to write about tends to be the hard part, consider following this journaling idea: have each student complete one page per day, divided into three sections about what they're reading, feeling, and learning. If you'd like to "theme" your prompts, you have the option to make them as complex or as simple as you'd like. Have students submit entries they're particularly proud of, for sharing with the greater class, and use all students' reading, feeling, and learning entries as opportunities to foster larger lessons and discussions with the whole group. It's crowdsourcing, weaved into your curriculum!