4-7-8 breathing relaxation technique

Find a comfortable place to sit with your back straight.
Place your tongue against the back of your top teeth and keep it there.
Exhale completely through your mouth around your tongue, making a whoosh sound. Purse your lips if it helps.
Close your lips and inhale through your nose for a count of four.
Hold your breath for a count of seven.
Exhale completely through your mouth making a whoosh sound for a count of eight.
This completes one cycle. Repeat for three more cycles.