I recently attended a brilliant series of workshops with Deb Dana, a clinician and expert on Polyvagal-informed practice.
One of our exercises was to watch a video of nature for five minutes.
The effect was deeper breathing, a decreased heart rate and a feeling of peace and relaxation, as well as connectedness with fellow workshop attendees.
Watching five minutes of nature has been proven to help activate our parasympathetic nervous system.
Despite the fact that screens of any kind are a big no-no while listening to the Safe and Sound Protocol, I think that watching a calming nature video, either as a way to co-regulate with clients before listening or after listening, would be a really lovely way to start/end our online sessions.