Abstract: An apparatus for use in exercising in water, preferably deep water running, includes a shoe that is configured to be worn by the user. The shoe includes a plurality of drag-generating elements attached to and extending from each side of said shoe for generating drag forces on the shoe during movement in water. The drag-generating elements generate more drag for movement of said shoe in a rearward direction than in a forward direction and are sized and positioned to simulate the forces on the user's foot arising from land-based running.