Carafang has it right. All tests in John Carter of Mars are Attribute Tests and always use two Atrributes and not just one. While the primary Attribute for a Movement test has to be Daring, the second Attribute can be anything the player decides fits the situation. Might or Reason, the examples provided, are the common sense ones, but I could see Cunning for moving cautiously or stealthily, Empathy if the player character has an awareness about terrain such as this, and even Passion if the player character was someone who liked climbing as a hobby.
Hope that clarifies the situation a bit more for you.