The Challenges of Hiking in the Sierra Mountains

"I've known Mike for a long time since I was 15 years old actually. We went to high school together and now he lives in Seattle and I live in San Francisco." "We're going to be hiking south of Yosemite in the Sierra Mountains. There are no roads where we're going, so we'll do a big loop" 'On a long trip like this, six days hiking, there are some challenges, some difficulties'