For almost 13 minutes Rotorua's Clay Gulliver breathed as hard as he could to race to the top of Auckland's Sky Tower.
In his first attempt at the Firefighter Sky Tower Stair Challenge the 26-year-old managed to break the top 50. He now has ambitions to next year get a top 10 spot.
Mr Gulliver, who is a volunteer with the Ngongotaha Volunteer Fire Brigade, reached the top on Saturday in 12 minutes and 54 seconds. He was wearing full firefighting kit, including 25kg breathing apparatus, and he was breathing through the unit.
The challenge was a fundraiser for Leukaemia and Blood Cancer New Zealand.
"It was a great experience but she was hard work," Mr Gulliver said.