Tee hee. "Mountain Climbers" are a cardio workout a bit like jumping jacks. I don't think the OP is talking about climbing mountains. :)
Personally, I've never heard that specific move given another name, but there are thousands upon thousands of ways to move your body, and the Spark database is only so big.
Since it's cardio, not ST, anyway, just chose something similar. Perhaps jumping jacks, calisthenics, or "high impact aerobics".
Deb, in New Zealand