I met Sarah Lightman as she whizzed round Salcey Forest at a recent Big Bear Events race.
Sarah, however, wasn't running, she was race walking - and the event was her second Ultra in as many days.
It perhaps shouldn't have been a surprise though. Sarah's dad, Shaun Lightman, finished 18th in the Men's 50km walk at the 1968 Summer Olympics.
I spoke to Sarah about why she prefers race walking to running...