Indoor ski training facility ...

In Europe and Scandinavia, nordic racers use ski tunnels for training in the summer. (Of course, they also ski on glaciers or travel to New Zealand.) As for learning how to alpine ski, people have learned on indoor slopes in Great Britain or even Abu Dhabi.

I am exploring off-hour usage of the Big Snow facility at the American Dream Mall in New Jersey, and using it for week-long nordic racing camps.  It could be perfect for summer training ... .3k loop with 50 meters of climbing, an hour away from a New Jersey alpine ski area summit with 1000' vertical for bounding in the afternoon.

https://www.washingtonpost.com/lifestyle/style/the-future-of-american-skiing-may-be-inside-a-new-jersey-mall/2020/01/06/ddb22850-227a-11ea-a153-dce4b94e4249_story.html