That's the question being asked in the mountain biking world after English backed up another world title win a fortnight ago with Australian success over the weekend.

He gave up twice during the race at Stromlo Forest Park in the Australian Capital Territory. English was mentally and physically exhausted after the worlds at Weaverville, California, the weekend before.

English kept going though, and through some consistent lap times, he'd put a gap on the field by the 4am mark, and was able to pull the pin on the race by 11am.

He relaxed when the second-placed rider didn't have enough time to start a last lap before the cut-off time.

Earlier, it didn't look like he could come through for another race win.

"Mentally, I was so busted," English said. "I was having caffeine after an hour and a half of racing."

The plan was to concede and spend the rest of the race at a cruisy pace, but English picked up and brought home his 10th Australian title.

Eight of those are 24 hour triumphs and two are marathon national titles.

English has six world titles to his name.

The 35-year-old isn't considering retirement at the moment though.

"That's a very good question," he said when asked if he'd thought about giving up the sport.

"At the moment, when I'm winning races [at world title level], I'm getting an air fare to the next race."

English's family wife Jennii and children Archie, four and Sylvie, almost two camped overnight at the race site.

He paid tribute to Jennii for her work in ensuring he was always in peak condition with the right nutrition.

"One key thing is getting nutrition sorted, and we've done that," he said.

He's come a long way since fuelling his last race with donuts and croissants.

"I was a uni student," he said.

"I went and bought whatever was on sale."

The next English generation could already be well on his way to success. Archie has been bitten by the mountain biking bug.

"When we went down to the park, he couldn't keep up," he said. "I was faster."