Definitions for "Prone"
Prostrate; flat; esp., lying with the face down; -- opposed to supine.
Headlong; running downward or headlong.
Lying face down on the abdomen.
Bending forward; inclined; not erect.
Sloping, with reference to a line or surface; declivous; inclined; not level.
Inclined; propense; disposed; -- applied to the mind or affections, usually in an ill sense. Followed by to.
having a tendency (to); often used in combination; "a child prone to mischief"; "failure-prone"
Keywords:  liable, tending
tending or liable to.- Q R
likely to do something or suffer from something, especially something bad or harmful
Keywords:  spend, turn, model, getting, his
Any model who is prone must spend his/her/it's turn getting up.