You asked:
What does my body already know?
Before language, there's sensation. The body tends to register things a while before we agree to say them out loud, and this question is a way of checking in below the level of argument. What is your chest doing right now? Your stomach? Draw one card and read it back as a question: what have I been registering and not yet admitted?
Select one card. Trust the first pull.
The body files things early
You have almost certainly had the experience of your stomach knowing something several weeks before your mouth would say it. The dread on a Sunday evening that arrives before you've thought about work at all. The way your breathing changes when a particular person's name appears on your screen. The stiffness that shows up the week you agreed to a thing you didn't want to agree to.
None of this is mystical and none of it is diagnostic. It's just that the parts of you that process quickly don't use words, and so they get overruled by the parts that do. This draw is a way of letting the quick, wordless part get a sentence in.
Do the scan before you touch a card
Sixty seconds, top to bottom. Jaw. Throat. The space between your shoulder blades. Chest: is it open or is it braced. Stomach: is it settled or is it holding something. Hands. Notice, don't fix. The instinct to immediately correct what you find is another way of not listening.
Whatever you find, give it a plain word before you draw. Braced. Tired. Alert. Waiting. One word is enough, and one word is a great deal more honest than the paragraph you'd write if you gave yourself the chance.
Setting the card against the word
Now pull, and put the image next to your word. If they agree, you've had something confirmed that you were already privately sure of, and the confirmation may be permission to finally say it. If they disagree, that gap is more interesting than agreement would have been: it usually means one of the two is the story and the other is the fact, and you generally know which is which.
One boundary, said plainly: this is a reflective exercise, not a medical one. A card is not an assessment of your health, and a body that has been telling you something insistently for a long time deserves an actual professional, not a deck.