Use a calming technique in order to allow your students to become regulated. If you notice hyper-arousal behaviors, you may wish to select one of these activities. This helps with external regulation and used with fidelity, students will learn the strategies needed to regulate their emotions and increase their window of stress tolerance.
Color Visualization
Provide a color and breathe while visualizing things in all different colors
Belly Breathing
Feeling like a monster? Colbie Caillat and Common recommend a calming breath.
Breathing Deep
Host a "break" for breathing. For 6 total breathes have students.... breathe slowly(4 counts), Hold for 4 seconds, Breathe out slowly (4 cts), hold for 4 seconds