maybe I'm being too simplistic in this, but.... hiking = feet only climbing = hands and feet
Good way of putting it, to which I would only add a third line:
technical climbing = climbing with the use of technical climbing equipment
If future generations are to remember us with gratitude rather than contempt, we must leave them more than the miracle of technology. We must leave them a glimpse of the world as it was in the beginning, not just after we got through with it.
- Lyndon Johnson, on signing the Wilderness Act into law (1964)