Putting It Together
Forget the “knees out” cue—not because “knees out” is wrong, but because what you do when you attempt to follow that instruction isn’t what is intended.
To prepare for your squat, actively roll your heels in, flattening the arches of your feet—just a little will do. This will make the knee joint appear to deviate (toward each other). This is totally ok.
Next, while maintaining this new heel/knee position, shift your pelvis forward. You will notice that your knees automatically begin to rotate away from each other. Continue this forward shift until your weight is centered just behind the toe box, and equally between both feet with comfortable contact remaining between the heels and the floor.