In this new fantasy setting I'm building, then after getting the tectonic plates and their movements covered, I've found that the land would be very mountainous, plus numerous valleys, and the islands would be mostly just oceanic mountains and volcanoes. There are of course many plainer lands that aren't mountainous, but the majority of the land is just mountain and valley.
With this in mind, then humans--just assuming humans would still evolve with a little handwavium I'm sure won't overly offend--would likely need to evolve to be better climbers than earth humans, at the expense of a little of their sprinting abilities. But what adaptions would be most important for that, and still be viable for a human species?
What I've come up with so far are grip strength and upper body strength, more dexterous feet, and possibly less need for a lower center of gravity. Have I got it on the mark, or should there be some other things to consider?