The Kokoda Track has remained famous for the Second World War heroics of the Fuzzy Wuzzy Angels who helped Australian soldiers.

Mr Delahunty said he walked between eight and 13 hours a day, covering the 130 kilometres of the gruelling track, which gave him time to reflect.

"It really was life changing, you are out of contact with radio, television, newspapers, mobile phones, most of us didn't even wear a watch," he said.

"The isolation gives you time to think about your life and what people have put up with before you, like the soldiers.

"You think about Australia, what a great country we live in and appreciate all the things we have."

Mr Delahunty trekked Kokoda with parliamentary colleagues Bill Sykes, Terry Mulder, Gary Blackwood and David Morris and 30 other trekkers from across Australia.

"It was a real initiation into the jungle," he said.

"We walked twice at night and we went off the main route through native jungle. The first night we set up camp in virgin land."

Mr Delahunty said the trek exceeded his expectations.

"I never anticipated how thick the jungle was and how isolated you are," he said.

"I didn't anticipate how great the people would be to us, the highland people that helped us were descendants of the Fuzzy Wuzzies and were beautiful people.

"I don't know how they carried soldiers up and down the mountains. They were very talented."

Mr Delahunty said the trek was challenging.

"My training did come in handy but my knees got very sore. I had to use deep heat ointment, which I haven't used since my football days," he said.

"The climate was variable, hot and sunny, then steamy and then a thunderstorm.

"The perspiration was unbelievable. In the morning you would put on wet clothes because of the dew but your body heat would dry it out and then five to 10 minutes later you would be wet again."

Mr Delahunty said a highlight of the trek was seeing the Second World War battle sites.

"The memorials at Brigade Hill and Isurava, sites of history determining fight to the death battles and acts of unbelievable bravery by Australian soldiers," he said.

"The dawn service at Isurava was a special event for all the trekkers and the words on a memorial say it all, courage, sacrifice, endurance, mateship."

Mr Delahunty returned to Australia last weekend, still sporting a shaved head and having lost some weight.