Our brains work well with a visual to hold on to. This website has many different examples of how to use shapes to help students to focus on and steady their breathing. A minute of class time spent breathing can make a dramatic difference in terms of focus, engagement, and behavior issues.
Though not accessible to everyone, the Apple Watch has a simple breathing app that some children find simple and fun to use. There are many other breathing apps available as well.
Core Competencies: self awareness, self management