"Only a dev" myself, and no knowledge about climbing :)
3rd one (top right) if I had to pick from those options
last one (bottom right) for me looksl like it best reflects the "climbing visual (including hurdles)", so maybe adding a red dot into one of the squares and using the same font as in #3 brings all those parts together?
Thanks for the feedback!
It's not a bad idea at all, I will try