Any part of his body, except his foot.
See 9-1-3g
A player occupying a marked lane space may not have either foot beyond the vertical plane of the outside edge of any lane boundary, or beyond the vertical plane of any edge of the space (2 inches by 36 inches) designated by a lane-space mark or beyond the vertical plane of any edge of the space (12 inches by 36 inches) designated by a neutral zone.
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