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If you can’t do it for 15 minutes, you don’t. You just stop. Have you never been to a gym?
In elementary school we did this and our gym teacher said if we could do it more than ten minutes he would buy us McDonald’s. The class ended and a kid was still doing it, he got his McDonald’s and a Walkman from the teacher. >

What a legend. >

That kid did a 15 minute wall sit?  Daaaamn. Fucked up thing to do to a kid though. >

I recall having to do a couple minutes at a basketball camp and being so sore the next day. That seems insanely long. >

I rowed in college, we’d do hour long wall sit sessions. The key is shifting pressure back and forth between your legs and making sure your feet and your back have a ton of grip on the ground and the wall to avoid any additional strain. >

That's really smart. >

Sitting on the ground is much smarter >

I could lay down in bed and take a nap in my sleep. >

Big brain >

He should have warned him! >

Here's the wiki for a wall sit: link
15 minutes is a very long time to do it. It's described as being like a 'jetliner position', which can be used as a form of physical torment. >

In HS several of my teachers would use wall-sits as a deterrent from being late to class. 1 min of wall-sits per minute late. No one ever did more than 6 minutes iirc. It seemed like a fairly harmless deterrent from being late. 
I was the fat kid in highschool and couldn't even finish a mile in 20 minutes. But I could do my share of wall-sits same as the rest of my classmates. I don't see how it's any different than forcing kids to do physical activity in phy-ed. So many things in phy-ed hurt way worse than wall sits. And I tried my best to do them all anyway. >

Ever done one for 15 minutes?