David Gricius works with iliac Golf, a golf instruction and performance company that takes its name from the iliac crest — the hip bone that anchors the rotational movement central to an efficient golf swing. The anatomical focus of the brand reflects an instruction philosophy built around understanding how the body's structure and movement patterns create the swing rather than imposing a theoretical swing model on a body that may not be built to support it. Gricius's work through iliac represents the intersection of biomechanics and golf instruction that has become increasingly central to how the game's best educators approach player development.