蜜芽传媒

Steph Hammerman was born with cerebral palsy and doctors believed she would never walk, talk, read or write.

But the 29-year-old from North Carolina, who has also fought off cancer, has become the world's first CrossFit trainer with the condition.

Cerebral palsy is the name for a group of lifelong conditions that affect movement and co-ordination.

Video produced by Daniel South