The relay was formed by exercise physiologist Brent Collier, 35, of Kirrawee, to raise funds for Sutherland Relay For Life.

The Sutherland relay, on May 5, raises money for the Cancer Council to provide research, education and support.

Short Circuit follows a 10-kilometre loop through the national park and is open to riders of all experience levels, including beginners.

The event is also a great day out for non-participants, with a kids' bike clinic, jumping castle, face-painting and barbecue.

Registration fees have been kept low ($30) to encourage riders to be raise their own sponsorship. Public donations are also welcomed.

Short Circuit raised $30,000 last year and has already attracted double the amount of entrants on last year's figures.

Mr Collier, who is on the relay committee, works with patients with post-cancer fatigue.

The Cancer Council was his support through his own cancer scares.

"Going to endless amounts of funerals a year gets to you a bit," Mr Collier said. "I'm really, really the lucky one."

Sid Taberlay is riding with his wife, a medical researcher. Mr Collier said it was the first time Taberlay's wife had ridden in an event with her husband.

Short Circuit registrations will be capped at 60 teams of four, plus individual entrants. Riders will meet in Mimosa Street, Heathcote, at 7am for registration. Relay starts at 8am.

Fund-raising/donations: everydayhero.com.au/brent_collier ; details: www.peak-health.com.au/shortcircu it.