I've heard a couple of times of this technique by the US Army in which you relax your body starting by the face, then arms, torso, legs. Finally you picture you

I've heard a couple of times of this technique by the US Army in which you relax your body starting by the face, then arms, torso, legs. Finally you picture yourself in a canoe in the middle of a lake or something similar to avoid thinking of anything. Anyone knows how effective is this? https://medium.com/s/story/combat-tested-training-unwind-and-sleep-anywhere-in-120-seconds-27d5307b7606 https://medium.com/s/story/combat-tested-training-unwind-and...