Just finished my 200th attic crawl this year and my knees are screaming. | Cable Installers - Freelance Forum - The Community for Independent Professionals
From my own time doing similar work, it was actually a huge relief on my joints. Getting into the right form took pressure off my knees compared to standing all day. A lot depends on your body and how you set things up. My experience was totally different, but everyone has their own thing that works.