A fitness fanatic is taking on the world's largest obstacle course in support of his brother-in-law battling an aggressive blood cancer.

Brad Fisher, 32, from Columbine Road in Horsford, will clamber through 20 miles of mud, cargo nets, tunnels, slides and freezing cold water as part of Rat Race Dirty Weekend at Burghley House, Stamford, on May 6.

He hopes to raise £25,000 for the Anthony Nolan charity, which supports people with cancer of the blood or bone marrow, through the race and other fundraisers.

It will be the second time the father-of-two, who is head coach at Norwich Fitness Centre, has risen to the challenge.

Mr Fisher is supporting the cancer charity because the day before last year's Rat Race Dirty Weekend he learned his brother-in-law, Jon Leggett, had been diagnosed with acute myeloid leukaemia (AML).

This year, he will be joined by 19 friends from the fitness club including his sister Harry Leggett.

Mr Fisher said: 'Hearing Jon had leukaemia was a big shock to me. It's the first time someone close to me has been diagnosed with cancer.'

AML is a cancer of the white blood cells and around 2,600 people are diagnosed with it each year in the UK.

Mr Leggett completed a course of chemotherapy in November 2016 and is now in remission.

The Rat Race Dirty Weekend features 200 obstacles aiming to stop the runners in their tracks, forcing them to jump, crawl and clamber to the finish line.

This year's race will also include a five-story high slide and Gladiators-style uphill travelator.

Mr Fisher added: 'The race was the hardest thing I had ever done last year. After the event I told myself I was never doing it again - it was that tough. The obstacles were not bad but I'm stocky, so I'm not much of a runner.

'But after a while I thought about it and thought about the sense of achievement, and decided I would do it again but this time it would be for Anthony Nolan. The furthest my sister has ever run is three miles, so she will be in for a shock.'

Since Christmas the team of 20 have raised around £5,000 of their ambitious £25,000 target through various fundraisers.

To make a donation visit www.justgiving.com/fundraising/Brad-Fisher2