In his old swing with Butch Harmon, Tiger allowed his head to move laterally away from the target during the backswing. This shifted weight from his left foot to his right. When looking at the new position, you can see the torque put on his left knee. He is pivoting on the front foot during the backswing, placing an even heavier burden on an already shaky left leg. This is a classic Catch-22: He has a new method that needs a great deal of repetition. Unfortunately, the new method puts more strain on his knee, which limits how much he can practice.
Go back to the future. Tiger needs to work back to the pivot and wider position at the top that saw him dominate the game earlier in his career.
Walk like Bigfoot. It takes practice to walk like a Sasquatch, but you learn to use your thigh muscles to plant the leg and control the motion. Most people overuse their hips and shoulders, causing the knees to hyperextend. The knees are bent as you walk, and there's no locking out the knee. The Sasquatch style looks funny but can save an injured knee.
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