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If the skates are not ground down properly, you will not achieve a real speed no matter how hard you try.
Skates with a wide blade can be ground down with a thick round file or an emery stone rotating in the machine.
Only sharp skates allow you to feel comfortable while skating on the ice and, of course, to develop the maximum possible speed.
So do not let yourself go skating with blunt skates! Grind down your skates regularly!