He was joined by other royals as well as veterans, politicians and members of the public, who welcomed the military groups as they drew nearer the Palace.
"This is not child's play, and we can pray for good health, but also recognise that if you're not in good enough health to do the job, you shouldn't be doing the job," he added.Dr Ezekiel Emanuel, an oncologist who worked as a Covid adviser to the Biden White House, was among those claiming that Biden probably had been ill with cancer for some time, without necessarily knowing it.
"He did not develop in the last 100, 200 days. He had it while he was president," he told MSNBC's Morning Joe show. "He probably had it at the start of his presidency in 2021. Yes, I don't think there's any disagreement about that."US medical guidelines do not recommend routine blood screenings for men over 70 because prostate cancers can be very slow-growing, and the difficulty of testing and treatment may outweigh the risk from the cancer.Biden had previously been diagnosed with benign enlargement of the prostate. In 2019, before he was elected, his campaign released the report from his medical screening, saying he had been treated with medication and surgery, "and has never had prostate cancer".
That's led to questions about whether Biden was tested at any point during his four-year presidency - and why the diagnosis came so late."I would assume the former president gets a very thorough physical every year," Dr Chris George of the Northwestern Health Network told Reuters. "It's sort of hard for me to believe that he's had a (blood test) within the past year that was normal."
However, Dr Robert Figlin, interim director of Cedars-Sinai Cancer, told the BBC that the aggressive way Biden's cancer had presented was not that unusual. And he warned critics against "assuming that somehow something was missed along the way".
Prostate cancer is the second most common cancer for men, according to the Cleveland Clinic.The Nullabor Plain - a vast area of desert that crosses from Western Australia to South Australia - was also "unforgiving", he said.
Surprisingly though, Goodge said he was "feeling very comfortable" now that the run was over.Moments after crossing the finish line, Goodge placed a bunch of flowers on Bondi's famous shoreline in memory of his late mother.
"She was the most special person in my life," he told the Guardian Australia, adding, "she would be proud of everything I've done - she'd also be concerned".Goodge said thinking about how his mother battled cancer was crucial during his journey, and helped him overlook his own suffering.