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if there is friction on the hill it will slow you down
skiing is......... going down hill on snow using skies to guid you
Snowsport
aerobic.
when you are skiing down a hill and you want to slow down
*Cross country* skiing is where you are skiing on flat terrain. It's much more work than skiing down a hill.
Down Hill Skiing
slalom
Ski bas d'une colline
the judges score on how fast you go down the hill.
That loosely describes skiing.
The answer to this riddle is "skiing."