BBC Sport
Marathon runner Eliud Kipchoge believes he can get even closer to a possible sub-two hour marathon after narrowing the gap by 30 seconds when setting his recent world record in Berlin last month.
The 37-year-old ran a time of two hours, one minute and nine seconds to beat his previous benchmark, which had stood since 2018.
"I believe that I still have time to show the world how to push limits," the Kenyan told the BBC World Service.
"I can still run my personal best in the near future. I can still try again."
Four years ago, Kipchoge took 78 seconds off compatriot Dennis Kimetto's 2014 record of 2:02.57.
He then became the first man to run a marathon in under two hours in 2019, yet the time in Vienna could not be an official world record since it was not in open competition and he used a team of rotating pacemakers, among other measures.
Kipchoge ran the first half of late September's race in Berlin in 59 minutes and 51 seconds, prompting thoughts that he may become the first runner to break the two-hour mark in an official race.
He had played down his chances of a world record in the build-up, but admits lowering his time had been his stated aim in the German capital.
"My plan was not to run under two hours, my plan was to break a world record," he said.
"I realise that we are fast enough to run under an hour in a half-marathon, which was really motivating for me.
"And it's a good sign also that the future is clear. I'm showing the people that you can [go] as fast as you can for the half-marathon and still do something good at the end of it."
Kipchoge turns 38 next month and now says winning the Olympic marathon at the Paris Games in 2024 is on his "bucket list".
He was won the past two Olympic titles - becoming just the third person to defend a marathon title when he crossed the line in Tokyo - and a third successive triumph would be a first for a man or woman.
"I trust that all things will carry me well up to 2024 to present myself at the starting line," he said.
"What I like is history. To be the first human being to run back-to-back-to-back for three times and win Olympic marathon gold medal, it's my bucket list.
"It's there in my mind. I don't know what will happen but still, for now, I want to concentrate on recovering my body."