"And don't forget you're wearing full firefighting gear with breathing apparatus, it feels a bit like breathing through a straw. You're not getting air from everywhere.
"I had no idea how hard something like that could be. And afterwards once you take your mask off - you need other people to hold you, you're that absolutely stuffed that you can't event stand up properly."
The senior firefighter impressed at the Nationals in March - taking out the over 40s title and finishing fourth in the open women.
Her time of 3 minutes and 18 seconds put her into the 'Lion's Den', an award given to the world's fastest combat challengers.
"I'll try to break the three-minute mark which would be absolutely awesome for me so hopefully all that training pays off and it all comes together on the day and I manage it."
The sole representative from the New Zealand Fire Service - Tanja hopes the countless hours of stair-climbs and weights training will bring rewards on an international stage.
Made with funding from NZ on Air