In winter sports,
we need friction to be as low as possible so that we can achieve
Ice skaters actually move on a layer of water, and don't skate on ice at all. When ice is subjected to high pressure it melts.
The narrow blades of the skates create a very high pressure and thus the skaters glide along on a layer of water they've just melted. The water refreezes as soon as they've moved on.
This is called " regelation " (sounds like something that happens to a football team, but it's spelt differently!)