In the 1920s, the American physician Edmund Jacobson noticed something odd about his anxious patients: even at rest, their muscles were quietly braced, holding a chronic tension they had no idea they were carrying. He reasoned that teaching them to release it directly would calm the mind along with the body — and the technique he built around that idea, still sometimes called Jacobson’s relaxation technique, rests on a simple insight: it’s easier to feel what relaxation is when you first do the opposite. You deliberately tense one muscle group for a few seconds, then let it go all at once, and in the contrast between the squeeze and the release you find a depth of relaxation that’s hard to reach by just trying to relax.
The method works its way methodically through the body, typically starting at the feet and climbing to the face, tensing and releasing each group in turn. Holding a muscle taut for five seconds and then dropping it for fifteen creates a vivid, felt sense of letting go, and over a full pass that accumulated release ripples outward into the nervous system as a whole. Physical and mental tension are tightly coupled, so loosening one tends to loosen the other. The research bears this out: a controlled study found that progressive muscle relaxation produces meaningful reductions in perceived stress, anxiety, and even measurable stress hormones like cortisol, making it one of the better-evidenced relaxation methods available.
In Shora, the app turns to progressive muscle relaxation when your check-in reads tense, wound-up, or restless in the body — especially in the evening, when tension that’s been accumulating all day tends to make itself known. It paces the tense-and-release rhythm for you, group by group, so you can simply follow the cue to squeeze, the cue to let go, and the spreading ease that follows.
A full pass through the body runs four to twenty-five minutes depending on how many groups you include.
