A skate includes a holder frame, a boot, and a locking mechanism. The apparatus has a first computer system, a second computer system, and a rules engine. In some embodiments the fastener can be released, for removal and re-use. The receiving chamber has a smaller transversal cross-section than the respective cross-section in the region of the second and the third housing section in the region of the first housing section which connects the second and the third housing sections.