This is the horrifying moment a gymnast broke his leg - while doing a 10m front flip. br br Cameron Orr, a personal trainer from Hackney, east London, was at gymnastics practice at the end of July when he suffered a nasty accident while attempting different acrobatics. br br Video footage of the incident shows the 26-year-old running up to the mat and flipping over a distance of 10m - before landing incorrectly on his right leg and crashing to the ground. br br Cameron says the bone "snapped" immediately - causing him "unbelievable" pain.