the foot plate 50 can roll against the foot cushion 35 to align to the ground surface and allow the plunger 30 and pogo stick 10 to rotate about the contact point this embodiment has a five 5 inch diameter disk of 0 75 inch plywood as the foot plate 50 and was found to function well on grass gravel and sand and reduces the tendency of the foot to sink into the ground an alternate design shown in fig1 uses a ball pivot 45 that attaches to the end of the plunger 30 and rests in a socket 46 springs or elastic bands 47 are used to keep the foot plate 50 nominally perpendicular to the plunger 30 while allowing the foot plate 50 to align itself with the ground surface the springs 47 may also hold the ball 45 and socket 46 together small rubber feet 38 shown in fig1 may be used to increase traction on smooth surfaces cleats 39 shown in fig1 may be used to increase traction on soft surfaces maximum hopping height depends both on the amount of energy put into the spring and the ability of the user to maintain an upright posture spring energy is limited by the maximum compression force the user can exert on the spring but energy is also proportional to the plunger stroke length so energy and hopping height greater than demonstrated in the present embodiment are likely possible the maximum stroke length may be limited mainly by the available space and geometry of the device experiments have shown that control of upright attitude is increasingly difficult with higher hopping heights and flight times but training may allow heights much greater than the 40 inches achieved thus far another embodiment of the present invention comprises a device.