They throw themselves into the absolute elite, and are part of a Swedish golden athletics generation that is flourishing at the same time.
Daniel Ståhl, reigning world and Olympic champion in discus - and constantly by his side Simon Pettersson who took sensational silver in Tokyo.
They train together, travel together, compete together, and live together in hotels.
Ståhl and Pettersson are a close-knit duo who are also each other's biggest competitors.
- It is an individual sport, we compete against each other.
But if you are two from the same country, you still become a little team against the others.
It's just a plus for both of us, says Simon Pettersson to SVT Sport.
"Absolutely unique"
Federation captain Kajsa Bergqvist is amazed at how the discus duo succeeds with their combined relationship.
- I think it is something completely unique, I can not understand it.
But that's because they are such nice people and treat each other to success, says Bergqvist.
Ståhl and Pettersson have flourished together - but in the competition relationship there has always been a clear first in Daniel and second in Simon.
"A game angle"
- What would Simon Pettersson be without Daniel Ståhl?
He would never be as good, says Ståhls and Pettersson's coach Vésteinn Hafsteinsson.
Would Daniel be as good without Simon?
- No.
Simon is a workhorse and Daniel is a wasteland and I think that is a good combination.
Daniel trains better to catch up with Simon's incredible work ability.
See the whole meeting here:
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Daniel Ståhl and Simon Pettersson's unique relationship - best friends and rivals