"I'm not great with ice. Obviously I don't have high body fat to keep me warm, but it's all for a good cause so you put up with it," he laughed ahead of his icy date at the MCG on Monday.

"I'll certainly be looking forward to the hot shower after."

Moneghetti is one of eight elite athletes taking the plunge to help raise funds for Neale Daniher's FightMND charity.

He said elite athletes were tough, but that toughness barely measured against that of people fighting the disease which kills the nerve cells that control muscle function.

Moneghetti didn't need to think twice when asked to be one of the 2017 sliders.

"I've crossed paths with Neale over the years so when the theme Heart and Soul, Green and Gold was decided he got in touch," he said.

"Australian sports people are known for being pretty tough so it's a nice analogy for FightMND."

As well as helping raise awareness and funds for the charity, the MCG event will be a chance for Moneghetti to catch up with fellow Olympic athletes.

The 2017 class of sliders includes tennis ace Lleyton Hewitt, pole vaulter Steve Hooker, aerial skier Alisa Camplin, speed skater Steven Bradbury, basketballer Andrew Gaze, netballer Sharelle McMahon, and cricketer Adam Gilchrist.

The Big Freeze campaigns over the past three years have raised more than $8 million which FightMND has committed to funding vital MND research.