An apparatus includes a heel platform section, a mid-foot section juxtaposed to the heel platform section, and a toe section juxtaposed to the mid-foot section. The mid-foot section and toe section collectively have a geometric shape having a first slope of a polarity along an inner edge of the apparatus from the toe section to the mid-foot section and a second slope of the polarity along the inner edge of the apparatus to the outer edge of the apparatus at the toe section.