Abstract: An adapter or module is provided to convert a walking stroller to a jogging stroller. The adapter includes an adapter frame having side members and at least one end member, ground engaging wheels rotatably mounted to the frame, and at least one clamp mounted to each adapter frame side member to releasably hold the stroller's frame, to secure the stroller frame to the adapter. The clamps are mounted to the side members so that they can be selectively positioned along the side members. The end member is secured to the side members so that the width of the adapter frame can be altered. The adapter frame can thus be used with strollers of varying widths and lengths.