In a plank or on your knees with straight arms, let the chest sink between the shoulder blades, then push the floor away so the upper back rounds slightly. The elbows stay locked so only the shoulder blades move.
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Movement guide
Existing guide · editorial review pending. Clinical review is pending.
3 sets of 10 with a one second pause at the top.
Use an incline or drop to the knees if a full plank makes the low back sag or the wrists complain.
Sources support the educational description; they do not establish that this exercise is suitable for you.
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No variation is labeled clinically validated.