John,
During any designated spot throw-in, (as opposed to a throw-in after a made or awarded basket or free throw) the thrower has a 3-foot wide spot from which to throw. As noted by Mick he may go as far back as possible. He must keep one foot on or over the 3-foot wide area prior to releasing the ball. So, you MAY see some "side to side" movement that won't be whistled.
The thrower is not land-locked to where his feet are touching the floor...
dk
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