If you have a job that keeps you staring at a computer or sitting down all day then you are a candidate for a tight neck and the swing faults that result
Set up two hula hoops about a foot apart on your swing plane angle and then swing through the gap between them
The putting grip should be in the lifeline of the hands, not the fingers, so that you eliminate your wrists and hands from the stroke and allow your putting power to come from your shoulders