i can think of maybe 4 era's of skiing, and thats a stretch.
1. the beginning, like whirlybirds and spread eagles in the moguls
2. the beginning of new school, jp and friends invent the solomon 1080, shit was cash.
3. Freesking renaissance, 2003-2009 when we were realizing just what was possible with these dub planks, new stuff pretty much every year. rise of companies like armada and line (big names
4. now, modern era, 09-12, dialing everything down, progression has slowed down, and its more about style and cleanliness. but more and more people are beginning to ski, and smaller, newer, edgier, companies emerge like saga and jiberish, as big name companies, and challenge the older one
basically from this
hope that helps, you could include a section as like a precursor to freestyle skiing, get you up to 5 sections.
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