Fasting during daylight hours for Ramadan has never been made more difficult for Payne Haas than in the sweltering heat of Darwin this week.
Particularly punishing was the captain's run on Thursday prior to Brisbane's clash with Parramatta, when at 10am it was 35 degrees with 70 per cent humidity.
The powerhouse prop trained the only way he knows how - hard - and didn't have a drop to drink until the sun went down later that night.
He lost four kilograms in sweat and put it all back on when he ate again later that day.
"Wednesday when we first got to Darwin it was pretty hot and I just couldn't wait to drink water because I was stuffed," he said, after the 46-6 loss to Parramatta.
"It's a holy month though, it's for a good cause.
"I've just been trying to sip on as much water as I can during the night and try to get enough food in my body so I feel good the next day for training.
"The Broncos have been good, especially while I've been here."
It's a sacrifice that can have a significant impact on his elite NRL performances, but amazingly, it doesn't.
On Friday night the 21-year-old was again the best player on the field for the Broncos with a mammoth 171 running metres, eight tackle busts and 32 tackles.
He'd broken fast just 40 minutes before the game and still had the energy to deliver about and beyond his teammates.
"He's outstanding, Payne," said coach Kevin Walters.
"I'm just disappointed for him that the effort that he can put in like that, it's a shame he just hasn't got some more mates around him to help him out."
This is his third year of practising Ramadan and the Broncos staff are astounded at how well his body manages the intense sacrifice of no food or drink from mid-April to mid-May.
But for Haas observing the Muslim holy month allows him to appreciate how fortunate he is when he's able to break fast.
"You look at the struggles of people, some don't have much food or water and it makes me grateful for what I've got in this life right now, living in a country like Australia, compared to other countries where they don't get the resources we've got," he said.
"Just to have water and food I'm grateful for."