Participants of this year's Men's Health Urbanathlon may see some familiar faces - maybe even hear some familiar voices - as they crawl, leap, climb and run the race.

For the first time, radio personalities from ONE FM 91.3 - Glenn Ong, Cheryl Miles, Elliot Danker, Harry Corro, Andre Hoeden and Shaun Tupaz - have taken up the challenge of finishing the unique endurance event on March 13.

Each of them, along with about 3,000 race-goers, have to clear the race's nine obstacles along a 14km route, which starts and ends at the Kallang Practice Track.

"The race is going to be so noisy because we are DJs," quipped Ong.

The 46-year-old, well known for his sharp and candid humour throughout his 20 years as a DJ, admits his courage will be put to the test at the Urbanathlon.

"I never feel intimidated by running and running is never a problem for me," he said. "But it's the obstacles that will be a challenge and they seem intimidating."

Ong will have to negotiate a formidable line-up of obstacles like the Maze Runner, where participants are expected to crawl under a net while finding their way out of a maze.

"It's going to be a lot of fun and a special event for me," said the 1.80m-tall and 77kg Ong, who keeps fit by taking up Muay Thai and Brazilian jiu-jitsu classes at Evolve Mixed Martial Arts gym.

"But I just hope to get through this event injury-free. I don't want to end up in surgery and not being able to do jiu-jitsu for the rest of my life."

Ong, who adds the title "Egoman" to his name on his Twitter account, also hopes that his considerable ego will not be too bruised after the gruelling race.

"There will be so many people there, everybody will be watching us, so our faces and pride are on the line," he said.

He will also be "sharing the pain" with his long-time friend Chris Glaessel, whom he has known since 2005.

The 39-year-old German, who is the managing director of food and beverage and hospitality consulting firm Cir Vis, lives in Singapore with his wife and five-year-old son.

He told Ong: "I might have to carry you. That's what a buddy does."

The Urbanathlon is into its seventh edition this year, and a new highlight is the CrossFit station, which requires participants to execute workouts such as box jumps, alternate lunge jumps, overhead squats, sandbell overhead swings and wall throws in order to overcome the obstacle.

An element of surprise also awaits the participants, as the final obstacle will be revealed just before the start of the race.