An obstacle course has the appearance of a natural cave environment. The course may include a plurality of interconnected, hollow, three-dimensional shapes through which human users can pass. The shapes may be modular to allow various different configurations of the course. The shapes may contain models of cave formations (speleothems), with which the users are expected to avoid contact and close proximity. Electronic sensing may be provided for monitoring any contact and proximity of the users to the speleothems, and additional electronic circuitry may be provided to present feedback to the users regarding their performance in the course.