So what is the ATP Forehand?
Here is a good primer online that I came across.
ATP Forehand
As the discussion of wrist lag indicates if you want reliability and precision then you might best consider what has been a standard take-back for a long time. Rules about keeping the swing on the hitting side of the body are standard for all good and effective forehand strokes.
Another concern is when you reach wrist-lock. This is ideally between the forward part of the swing and the contact point. In many cases and especially from older styles is remained firm from beginning of the backswing to the finish, (follow through).
