Maximise Club Head Speed & Power
Without going into it too deeply, there are a lot of factors going into creating maximum club head speed, factors such as gravity, centrifugal force, leg strength ect, all play a role.
For most people though more speed could be generated by first, maximizing your arm swing, and then allowing the momentum of the club to work, or better still directing the momentum of the club correctly.
To understand this grip onto the club like you are playing a recorder instrument with a few fingers and swing it, this will allow you to feel the clubs momentum. This takes all the strength out of it, because getting the sequence of the swing correct is FAR more important than using strength.