Paula Radcliffe is good at running.
Her time of 2:15:25, set on the streets of London in 2003, still stands as the women's marathon record - a race that saw her run the 24th mile in five minutes and three seconds. She's also the women's world record holder for the 10K road race distance, clocking a knee-trembling 30:21 in the same year that she set her marathon record.
So you'll understand our apprehension at heading out for "a quick run" with Radcliffe as part of a Nike Run Club Shake Out Run; a casual five kilometre run ahead of London's marathon event.
If you've been inspired to get into running, here are some pointers from the record holding Brit.