I came across this video shot in Colo. Of an attempted cross country triangle flight.
It's long but very interesting in that there is thermal soaring as well as terrain generated lift. Plus great scenery.
The pilot does a good job of explaining what happening and what he is looking for.
Watch out you may get sucked into watching the whole thing. I did and really enjoyed it.
https://m.youtube.com/watch?v=4-LfoZ1GcpI
Cheers Richard