Although I can no longer find the description on the internet, here is a snippet.
"EMDR was invented by Francine Shapiro (1948 – 2019) in the late 1980s.
In a workshop, Shapiro related how the idea of the therapy came to her while she was taking a walk in the woods..."
I will state plainly that EMDR therapy is awesome. Once people find it they wont use any other kind. It is basically creating bi-lateral brainwave stimulation. This means that it moves energy from the left hemisphere of the brain to the right hemisphere and back again.
While walking this is...left foot...right foot...left foot...right foot...etc. So the brain waves are being sent back and forth. Left, right, left, right, etc. Simple but with profound results.