Travel.
The only action permitted when lying on the floor it to sit up. And I have never seen a person "sit up" from their belly (or any other position) to their knees as that would be getting up, not sitting up. Sitting up would be from their back to their butt.
Rising to the knees is a partial attempt to stand. Basically, the rule doesn't allow them to get to a more advantageous position aside from the specific one listed (sitting up).
Plus, if they had been on their back, and got to that position, you'd have had a rollover first....traveling long before they got to the knees.
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