>

A kid was forced to do it as punishment in a classroom, not an adult doing reps at the gym you moron. Do you know how to read?
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? >

If you can’t do it for 15 minutes, you don’t. You just stop. Have you never been to a gym?