Mason, 19, faces a tough run as the open 100m and 400m heats are less than an hour apart in the Albert Park precinct.

Now in his third season with Eaglehawk AC, Mason is aiming to race in the under-23 events at the nationals to be run from March 26 to April 3 at Sydney's Olympic Park.

"It will not be easy on Friday night," Mason said of racing in the open 100m heats which start at 6.32pm and then the 400m which begin at 7.25pm.

"Obviously the wind and temperature will play a part in deciding to stick with the 100m and 400m, or just settle on the 400m," he said of plans discussed with coach Terry Hicks.

To qualify for the nationals, Mason must run equal to or faster than 10.94 in the 100m, 22.04 in the 200m, and 48.84 in the 400m.

A season-best in the 100m was 10.95 at Box Hill, and he has run the 400m in 49.01.

Among the career highs was 21.89 in the 200m at last year's Unisport nationals in Sydney.

A lot of Mason's focus in 2021-22 is on the 400 metres.

"Every race is tough, but the 400m is incredibly tough.

"There's the lactic build-up, the bend on to the finishing straight, and it's a test of mental and physical toughness," Mason said.

Training for all three distances requires a major switch in the intensity levels.

"For the 100 metres a lot is about the start and being explosive from the gun to the finish.

"Sessions for the 400 focus more on longer repetitions, less recovery, and pushing through the lactic build-up.

"In the 200m the training reps are 150 metres, but the 400m it's up to 300m reps."

Mason is confident he has the pace and power to lead or be near it through the opening half of the 400 metres.

"Every race is challenging, but running fast and lowering times make it all worth it," he said.

Mason said his Hawks' clubmates play a big part.

"The people I train with are fantastic, not just their workrate, but the social aspect and having fun."

Three of them - Laura Kadri, open 100m and 400m; Angus McKindlay, under-20 400m; Cameron Smith, under-18 100m and 400m, will compete at Lakeside across the weekend.

Mason wore the Aussie singlet at Tuesday's training and one day aims to be racing in the green and gold.

Away from the track, Mason will soon start second-year psychological science studies at La Trobe University Bendigo, and is a lifeguard at Cohuna Swimming Pool.

Read more: Woods fires up to hit Colombia mark

Our journalists work hard to provide local, up-to-date news to the community. This is how you can access our trusted content: