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what would cause it to increase?
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The distance between the knees changes and that causes your "center" to move onto one foot or the other. The visualization enables your brain to do this in a way that serves the stroke.
Generally, when the knees move farther apart, the ground reaction force will be rotational/upward. When the knees move close together, the GRF will be linear/forward. However, this should be dictated by your natural stroke.