It's billed as one of the toughest assault courses on the planet.
And for two Slaithwaite mums and their friend from Cowlersley, the Tough Mudder course was no picnic.
Sally Greenwood, 32, and her chum Amber Joyce tackled the 12-mile, 25-obstacles course at Broughton Hall, Skipton, along with hundreds of other wannabe heroes.
As well as mud, fire, ice-water and a potential 10,000 volts of electric shock there were underground tunnels and island hops to navigate.
Sally, a bakery assistant at Brosters Farm Shop in Lindley Moor, said she was glad she had spent six months training and turning her kitchen into an impromptu gym.
She said: “It was great fun and I am pleased we did it. In fact we are all so pleased that we have booked to do it again next year.
“I’m hard of hearing so I wondered how I was going to cope with the water side of things with my hearing aid but I managed in the end.
“The ice water was the most daunting, you couldn't breathe.”
Sally completed the course in three and a half hours along with her team of eight. And she raised £350 for a deaf-based charity while Amber raised £300 for Kirkwood Hospice.
Amber, who completed the course with her cousin, Lindsay Booth from Cowlersley, said: “It was scary but we kept going. It was awful but it was good fun and I’m really looking forward to next year.
Hundreds of people took part in the event which draws competitors from across the country.
Company Tough Mudder boast that their obstacle course is designed by Special Forces and tests all round strength, stamina and determination.
And once you have finished pushing yourself beyond endurance, (only 78% of entrants successfully complete each challenge), entrants are met at the finish line with a pint and a live band.