Whoa! I just looked at the comments by the author, John Amorosano. Here's one:
One thing I should let everyone know is that there were a lot of days like the one going over Muir Pass, in terms of pain. The video doesn't show all the painful moments and altitude sickness. There were more mornings waking up stiff as a board than not, but I wanted to showcase more of the highs than the physical pain. I didn't walk normal for 2 weeks after I got home. So, to anyone attempting to hike this trail, be experienced. The Sierra can and will cut you down. Good luck!!
That confirms what I often think about long hikes -- there is a lot of hard work involved.
The video stays away from the grueling parts. I especially liked their "dancing" along the trail in some places. Makes it look like they're out on a lark. But
we know the truth. 
