Autogenic training [1] is exactly a relaxation technique focussing on the progressive relaxation of body regions. It is very easy to learn and a body-first approch to approach meditative states, which can then be used for auto-suggestion.
Asianomics released a video on how withdrawing groundwater can dramatically lower the elevation of entire cities — I was surprised by how large an effect just a couple of years of human activity can have.
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