Abstract: A board training apparatus comprising a platform which has a length, a width, a height, and an upper surface. A convexity is formed in the upper surface. The convexity has a base attached to the upper surface of the platform. The convexity has an upper apical region. In certain embodiments of the apparatus, the base of the convexity comprises pegs which detachably affix or attached into holes formed in the upper surface of the platform. The platform is embodied either as a solid monolith or as a hollow sized for containment of the detached convexity.