After this setting of the clubhead has taken place, position your rear foot as comfortably, and as near, as possible to the position it will take for your swing. Where and how you place your rear foot is one of the keys to balanced swinging because. If you do not point your rear toe out sufficiently it will hinder the turn of your backswing. Position your leading side and take your grip Bring the leading side of your body and your leading foot into line and, at the same time, bring your upper hand to the club and take your grip. Once this 'base' address has been established you will notice how professional players then 'fine tune'.
Tension is the great killer in golf.
Tense muscles cannot turn. Relaxed muscles allow for the smooth turning of the body, release of the clubhead and maximum transfer of energy from club to ball. To monitor body relaxation many professionals mentally check one or more parts of their body after they have settled in to their address position. The part of the body used is very much a matter of personal preference. I actually check two parts of my body - my hands and shoulders.