A restorable sand or pellet pile is provided for use as an amusement or exercise device. A sand or pellet collection chamber has inclined side walls that converge toward each other in a downward direction and having a bottom surface connected to the side walls. A support deck is positioned above the side walls of the collection chamber and is adapted to support sand or pellets on its upper surface. A safety grating is formed around the perimeter of the support deck to allow sand or pellets to flow downwardly therethrough into the collection chamber as children or adults play or exercise on the pile. A diaphragm pump is positioned in the collection chamber and pumps sand upwardly through a vertically extending conduit to restore the pile. The pump may be operated intermittently or continuously. Other pumping mechanisms may be used. The preferred embodiment utilizes resilient inclined side walls in the collection chamber and a vibrator connected to the side walls to cause the side walls to vibrate. The vibration causes the sand or pellets to become fluidized and flow more easily into the intake of the pump.