A goal for use in a ball sport such as football comprising: a net assembly comprising: a net; a first flexible post member and a second flexible post member, each of the first flexible post member and the second flexible post member attached to an edge of the net, and a flexible crossbar member attached to another edge of the net and extending from an upper end of the first flexible post member to an upper end of the second flexible post member; and a frame comprising one or more frame members configured to hold the net assembly in tension to form a goal having an opening defined by the first flexible post member, the second flexible post member and the flexible crossbar member with the net behind the opening to catch, in use, any balls passing through the opening; wherein: the flexible crossbar member has a first user-operable length selection means associated therewith, the first user-operable length selection means being operable to adjust a length of the flexible crossbar member and secure the flexible crossbar member at a user-selected length; and the frame comprises a frame member spanning a width of the goal, wherein the frame member has a second user-operable length selection means associated therewith, the second user-operable length selection means being operable to adjust a length of the frame member and secure the frame member at a user-selected length; wherein a width of the goal is adjustable, in use, by corresponding adjustments of the first user-operable length selection means and the second user-operable length selection means, thereby changing the respective lengths of the flexible crossbar member and the frame member spanning the width of the goal. a net assembly comprising: a net; a first flexible post member and a second flexible post member, each of the first flexible post member and the second flexible post member attached to an edge of the net, and a flexible crossbar member attached to another edge of the net and extending from an upper end of the first flexible post member to an upper end of the second flexible post member; and a net; a first flexible post member and a second flexible post member, each of the first flexible post member and the second flexible post member attached to an edge of the net, and a flexible crossbar member attached to another edge of the net and extending from an upper end of the first flexible post member to an upper end of the second flexible post member; and a frame comprising one or more frame members configured to hold the net assembly in tension to form a goal having an opening defined by the first flexible post member, the second flexible post member and the flexible crossbar member with the net behind the opening to catch, in use, any balls passing through the opening; wherein: the flexible crossbar member has a first user-operable length selection means associated therewith, the first user-operable length selection means being operable to adjust a length of the flexible crossbar member and secure the flexible crossbar member at a user-selected length; and the frame comprises a frame member spanning a width of the goal, wherein the frame member has a second user-operable length selection means associated therewith, the second user-operable length selection means being operable to adjust a length of the frame member and secure the frame member at a user-selected length; wherein a width of the goal is adjustable, in use, by corresponding adjustments of the first user-operable length selection means and the second user-operable length selection means, thereby changing the respective lengths of the flexible crossbar member and the frame member spanning the width of the goal. the flexible crossbar member has a first user-operable length selection means associated therewith, the first user-operable length selection means being operable to adjust a length of the flexible crossbar member and secure the flexible crossbar member at a user-selected length; and the frame comprises a frame member spanning a width of the goal, wherein the frame member has a second user-operable length selection means associated therewith, the second user-operable length selection means being operable to adjust a length of the frame member and secure the frame member at a user-selected length; wherein a width of the goal is adjustable, in use, by corresponding adjustments of the first user-operable length selection means and the second user-operable length selection means, thereby changing the respective lengths of the flexible crossbar member and the frame member spanning the width of the goal.