Commando challenge completed!
Mrs Harding was part of a team that took on the Royal Marines Commandos 5k endurance course.
The popular figure was a member of the Ninja's Worriers team, and they were raising funds for the Royal Marines and the Devon Air Ambulance Trust.
More than 1,000 braved the Royal Marines’ own endurance training course, something usually reserved for the recruits to earn their coveted Green Beret.
Entrants tackled a 5k or 10k course, tackled underwater and muddy obstacles; the submersed sheep dip, tunnels, mud and a stream wades.
Caroline Creer, Royal Marines Commando Challenge spokeswoman, said: “We were probably one of the few events taking place over that weekend that weren’t too worried about the weather, as it just made the mud muddier."
Mrs Harding is one of the most popular figures in the Rydal Penrhos community and is now in her 30th year at the school.
She was appointed Head last January and has been a revelation in the role