First off, I need to give my two cents plug for physical therapy. Two weeks ago I wouldn't have been able to have this item on my to-do list. And I'm grateful to know the specific exercises needed to keep my knees as mobile as possible. I even bought a board so I could continue with this particular exercise (the rest need no specific equipment I don't already have):
And Grant, I'd love it if the next time you're here, you lug it downstairs for me.
Note the sky hook to more safely get down. :-)
(Next time I'll add socks and gloves relative to leaning on the rough surface.)
And no worries, I wouldn't think of doing the other two on the more angled sides.
(Have already paid to have them checked.)
And yes, I had my phone in a velcro pocket around my neck, just in case. ;-)
Not that I expect I'd survive the fall, mind you -
just in case I knocked the ladder over.