Paula Radcliffe has revealed she started running again less than two weeks after giving birth to her daughter Isla in January.
Radcliffe has not yet decided whether to run a marathon this year
Radcliffe, 32, intends to compete at the World Championships in August but was not expected to resume running so soon after her marathon 27-hour labour.
She told Hello! magazine: "After five days I was doing lots of pushing the pram but I wasn't doing much else.
"I did my first jog after 12 days and now I've been running alternate days."
The marathon world record holder is not expected to return to serious training for a little longer.
Radcliffe and her family plan to move to her training camp in Colorado at the end of February to begin her preparations for the outdoor season.
"I wanted to take at least a month before I got back into my routine," said Radcliffe.
"I wouldn't think anything of taking up to a month off after a marathon and, in a way, this is similar.
"What will be different is getting used to training on less sleep."
Radcliffe has not yet decided whether she will contest the marathon or the 10,000m at the World Championships in Japan.