We don't have synonyms for striding yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are string, striking and standing.
(n) :
(skiing, uncountable) A technique for propelling forward that appears similar to walking, where a foot slides forward on the opposite side of a pole being planted to provide a location to apply force.
(n) :
(skiing, uncountable) A technique for propelling forward that appears similar to walking, where a foot slides forward on the opposite side of a pole being planted to provide a location to apply force.