Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: We chose one that was supposed to be especially challenging and started the climb up to some waterfalls . We went far enough to prove we " could " do it ... but not so far as to actually tire ourselves out . Back in town , we did some touristy things for the rest of the day .

Question: Why did they only climb far enough to prove that they could do it ?
They wanted the satisfaction of knowing they could achieve some of it but did n't want to risk hurting themselves
To avoid tiring themselves out.