My ribcage bends in a little when I push, Is this normal?

I don't have any bone diseases or anything but I just noticed that when I place my ahdn on my rib cage under my chest on the side (middle off addoman) if I gently push in against it I can feel the rib just bending in gently.

It Doesn't hurt or anything and it goes straight back to its normal position when I move away and its both sides not just one. IS this the same for everyone else?
My ribcage bends in a little when I push, Is this normal?
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