Feel slope through your whole lower body, not just feet
When feeling for slope, the speaker says not to rely only on your feet: the body senses tilt all the way up through the ankles, knees, hips and up to the waist, and people feel it in different places. Some good athletic golfers feel nothing in their feet, but when he asks about their hip joints or knees they realize they feel it there.
Channel: Mark Immelman
Watch official source at 13:39