A trampoline and enclosure system comprising: a trampoline comprising a flexible mat and a plurality of coil springs holding the mat in tension within a peripheral frame of the trampoline which surrounds the mat; and an enclosure system comprising a barrier of a flexible material surrounding the mat above the mat and having a lower peripheral part coupled directly or indirectly to the mat, and a plurality of resiliently flexible generally upright enclosure support members outside of the barrier relative to the mat and which support the barrier above the mat, and which are retained at or towards the lower ends of the enclosure support members by the frame so that the enclosure support members, when connected only at their lower ends to the frame of the trampoline and before fitting the barrier will extend at an angle away from the mat, and are free to resiliently deform away from the mat when impacted by a user against an enclosure support member and/or against said barrier of flexible material, and which are connected at or towards an upper peripheral edge part of the barrier and at or towards the upper ends of the enclosure support members so that the barrier is in tension and to draw and pre-tension the upper ends of the enclosure support members away from their natural state of rest, when said enclosure support members are connected only at their lower ends to the frame of the trampoline and towards the centre of the mat and so that such resilient deformation of one of the enclosure support members away from the mat causes resilient deformation of opposite enclosure support members towards the mat. a trampoline comprising a flexible mat and a plurality of coil springs holding the mat in tension within a peripheral frame of the trampoline which surrounds the mat; and an enclosure system comprising a barrier of a flexible material surrounding the mat above the mat and having a lower peripheral part coupled directly or indirectly to the mat, and a plurality of resiliently flexible generally upright enclosure support members outside of the barrier relative to the mat and which support the barrier above the mat, and which are retained at or towards the lower ends of the enclosure support members by the frame so that the enclosure support members, when connected only at their lower ends to the frame of the trampoline and before fitting the barrier will extend at an angle away from the mat, and are free to resiliently deform away from the mat when impacted by a user against an enclosure support member and/or against said barrier of flexible material, and which are connected at or towards an upper peripheral edge part of the barrier and at or towards the upper ends of the enclosure support members so that the barrier is in tension and to draw and pre-tension the upper ends of the enclosure support members away from their natural state of rest, when said enclosure support members are connected only at their lower ends to the frame of the trampoline and towards the centre of the mat and so that such resilient deformation of one of the enclosure support members away from the mat causes resilient deformation of opposite enclosure support members towards the mat.