Hi,
about flexability - I think that in sporst the prinsiple real name is S.A.I.D, but I call it - "What You Do, Is What You Get". You need two kind of flexability - active and passive. Passive is long static stretching that will increase your "basic" range of movement. "Active flexability is when your muscles can actually do this in sports."

Just an example about active flexability would be using 2 - 3 clubs and doing your normal warmup swings. This will also stretch your muscles.

So if you want flexability for golf, do the same moves as you would do when playing - just start easy. I liked very much "golftrainers" exercise. I would add a relaxed "throwing" or wave like back and forward rotation from your waist - so that arms will follow passively. Just work your waist so that your arms will do your normals swing - to both sides.

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Just a comment on strength - we have to use what we've got. Most of us have a relatively strong torso and legs. We can get faster results by learning a good technic and using what we have, than building new muscles.

and sometimes we will get better results not even trying to hit a long drive, but just hitting the fairway...