This thread is created to see if most experts agree on how much flexion in the knees there should be at address and what happens to both knee angles during the swing???????
Knee Bend At Address
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Knee Flex at address
Not to little that your restrictive in your swing. Not to much that it throws off your balance. Look at it this way, When you do a squat, you naturally change your upper body location to keep your center of gravity between your feet. This keeps you in balance. Also to much of a squat at address would restrict your hips movements, because they are tucked back more.
Ideally you want a position that allows free rotation of the hips, and free movement of the arms. To bent over and you can't rotate your hips, not bent over enough and your swing becomes way to vertical. There's variance for every golfer, but its not that much.
Knee Flex in the golf swing,
In the backswing your right leg extends/straightens from its normal position (let the great debate start again :p)
Then in the downswing, you gain that flexion back, were you get that classic squat maneuver that tiger and Rory do for power, the old Sam Sneed, Sit down for power tip. Then you get your left leg to straighten out in the finish, though it doesn't need to lock, it can have knee flex, look at tiger, he does this now to help take stress of his knee. Also bubba purposely flies his foot out in the follow through to protect his knee, that's why he looks off balance.
From the start position, Rory has a knee angle of 155 degrees, His knee angle goes to about 165 degrees, meaning he's gained 10 degrees of extension his his left knee at the top of the swing. Just before impact, he's knees are flexed to about 143 degrees. So he gain's over 20 degrees of flexion in his knees from the top of the backswing to the bottom.