The leisure leaders at Högavångsskolan usually arrange different challenges for the students where they can compete against each other.
It can be to do the most push-ups or to stand in the so-called hunter's rest with the legs at a 90 degree angle.
The other students managed a few minutes at best but no one was near Kimi Harju from 9C.
Time passed and the others could only watch his effort.
- Last week we had who could do the most push-ups and it was a big pressure.
The winner took 96 pieces and then we drove the hunter's rest, says leisure leader René Desaix.
"Exciting and fun"
After a while, it began to be searched on the internet what a possible Swedish record could be and the best time found was a ten-year-old in Uppsala who stood for three hours and a second.
- They started searching for the Swedish record and I thought I could beat it.
I was surprised and it was exciting and fun, says Kimi Harju.
Exercise pain in the legs
He stood so long that he had to pass the time watching a movie via a computer.
In the end, he stood for three hours, three minutes and 28 seconds.
- It feels in the legs with a little training pain, or quite a lot of training pain, I have trained a lot of legs and also train hockey, he says.
The time can be compared with Frida Hansdotter's noted contribution to the Masters of the Masters.
The former slalom skier then stood 26 minutes in hunting rest in the popular program.
The world record is close to twelve hours, a challenge that Kimi Harju plans to take on, according to the newspaper Sydöstran.