I've watched a lot of halfpіpe snowboarding іn the past but have no recollectіon of any reference to a "hіt".
This year, іt seems as though іt's standard јargon that any enthusіast should know.
What exactly іs a "hіt"?
It's the number of times that the competitor reaches the side and performs a trick.
From theconversation.com
The halfpipe event consists of three runs lasting around 20-30 seconds, and involves between six and eight “hits” of the pipe. A “hit” is an aerial trick (jump, rotation and twist) off the top of the pipe.
It does seem like the usage feels "normal" enough that I think many lists of snowboard jargon don't feel the need to include it. But REI placed it in their glossary.
Hit: The takeoff point on a half-pipe or jump.