Initiating Downswing-Left Leg

I read in a previous post that the left leg must be straight for the hips to turn, rather than slide. So is it a good idea to initiatiate the downswing by straightening the left leg, provided I am able to shift my weight over?

If you look at tiger woods , he snaps his left knee straight at impact to gain extra power .

Try to think about starting your downswing from the ground up. Make that focus on transferring your weight to your left foot with a little nudge to the left through your hips and left knee, and then uncoiling your left hip in advance of your shoulders. This sequence will automatically bring your arms and hands along, and therefore get you into a good position at impact.
. remember:this movement should never be violent or it will throw your whole downswing off..

hope this is of help.......cheers....Terry

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here is a good camera view i think that shows that

http://www.golfswing.com/proswings/woods2.htm

if you pause it and use your keyoard arrows you can step through the video

One of my drills is to feel that I push down on my left heel as I start down with my shoulders staying back. This transfers the weight and gets the right shoulder axis tilt as you start down

Do this with half swings first to get a feel for it and make sure your arms are extended down the target line at the halfway through point