An activity jumper for a child, the activity jumper comprising: a base; two vertical supports operably connected to the base and extending upward from the base, each vertical support including two arms (60,61) that extend away from the vertical support; a plurality of stretchable tension members (26a-26d), each tension member operably connected to one of the two arms (60,61) of one of the two vertical supports; a tabletop suspended by the tension members (26a-26d), the tabletop having a top play surface and a central opening with a child seat disposed in the central opening; characterized in that, each of the tension members comprises: a first strap operably connected to one of the arms (60,61) of one of the vertical supports; a second strap operably connected to the tabletop; and a piston connected to and extending between the first strap and the second strap, wherein the piston comprises a housing (72,74) and a spring enclosed by the housing (72,74), the housing having an inner member and an outer member which are operably connected to the two ends of the spring, such that, as the spring stretches, the inner member of the piston slides further out of the outer member of the piston, and wherein the first strap extends through the housing (72,74) and connects to one end of the spring and the second strap extends through the housing (72,74) and connects to another end of the spring. a base; two vertical supports operably connected to the base and extending upward from the base, each vertical support including two arms (60,61) that extend away from the vertical support; a plurality of stretchable tension members (26a-26d), each tension member operably connected to one of the two arms (60,61) of one of the two vertical supports; a tabletop suspended by the tension members (26a-26d), the tabletop having a top play surface and a central opening with a child seat disposed in the central opening; characterized in that, each of the tension members comprises: a first strap operably connected to one of the arms (60,61) of one of the vertical supports; a second strap operably connected to the tabletop; and a piston connected to and extending between the first strap and the second strap, wherein the piston comprises a housing (72,74) and a spring enclosed by the housing (72,74), the housing having an inner member and an outer member which are operably connected to the two ends of the spring, such that, as the spring stretches, the inner member of the piston slides further out of the outer member of the piston, and wherein the first strap extends through the housing (72,74) and connects to one end of the spring and the second strap extends through the housing (72,74) and connects to another end of the spring. a first strap operably connected to one of the arms (60,61) of one of the vertical supports; a second strap operably connected to the tabletop; and a piston connected to and extending between the first strap and the second strap, wherein the piston comprises a housing (72,74) and a spring enclosed by the housing (72,74), the housing having an inner member and an outer member which are operably connected to the two ends of the spring, such that, as the spring stretches, the inner member of the piston slides further out of the outer member of the piston, and wherein the first strap extends through the housing (72,74) and connects to one end of the spring and the second strap extends through the housing (72,74) and connects to another end of the spring.