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School admin here: it’s VERY hard for us to sub even for 15 minutes, as all student behavior and safety issues ultimately come to us.
I can’t go more than about 20min without needing to investigate a student behavior issue. Subbing the rest of the day in a class is nearly impossible.
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? >

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? >

There is a nationwide shortage of teachers primarily due to low pay and shitty parents. When that happens you get idiots like this in the classroom because school systems are desperate. If this is true that teacher should be fired on the spot. >

My daughter had a sub that was apparently a hardcore religious fanatic. He spent the class period telling all the girls that they should be ashamed for not wearing dresses and that they'd never find a husband. The kids immediately reported him.. and they still had him finish out the day with the principal "checking in often" because they had no one else(According to an email about the incident). 
I'm glad she's in middle school so she only had to deal with him for one period instead of all day.
In my state, they have a short course you can take to be a sub if you have a highschool diploma or GED. These "subs" are teaching for the entire year in some cases, though. >


they still had him finish out the day with the principal "checking in often"

At least the Principal wasn't like "So?"...  but yeah that sub should have been walked out and the Principal should have finished their day himself even if it just meant "Let's watch a movie about sea birds" (or not, see reply below)