Ping
Modern cross country skiers can do 45 to 50 MPH UPHILL, and 65 to 70 MPH DOWNHILL ~ or even faster on steeper slopes.
Depending on what sort of slope a hunter was willing to risk I suppose he could go faster.
The point of that being that the Sa'ami hunters were FASTER than the fastest animals on Earth ~ making them clearly the top predators. The cartoon definitely teaches you what skiing was all about.
The "dating" is a tad questionable ~ these petroglyphs are a tad more primitive than the OLDEST ones in Keralia ~ which are judged to be 7500 years old at a minimum. I suspect we'll get a NEW dating on this stuff before long. Or, maybe the quality regressed as time passed and folks got further from the "source" ~ which could be from further South.
Note, the Eastern Sa'ami DNA shows there was some sort of "meeting" with outsiders from some unknown area about 7500 years back ~ it has been hypothesized that these were the fella's who brought their language with them (and that's before the Finns and others in the region today had even coalesced and moved North).
It is always risky to attribute any particular petroglyph to any modern group, but in the Polar regions there really haven't been all that many people in ancient times ~ so such attributions are NOT as improbable as those in warmer areas.