Meedleyx10
Member
Still incorrect, as stated talk to your doctor or chiropractor. Lifting your legs in seated position uses your glutes, not your back muscles.
If you read this article, it talks about how lifting your legs off the ground REMOVES back strain.
http://healthguide.howstuffworks.com/back-pain-low-dictionary.htm
Try again .....
"Use a stool under your feet while sitting so that your knees are higher than your hips. "
Quoted from your link...keyword: feet...plural...not applicable to what we're talking about here. It's more about where your legs are positioned in relation to each other, and the alignment/misalignment issues that can cause.
Talk to any serious classical guitarist, teacher, doctor, chiropractor, or just use google. This is all fairly common knowledge amongst classical players and discussions on it can be found on pretty much any classical guitar forum...a brief google search will show you plenty.