Despite completing 100 marathons in as many days, ultra-fit fundraiser Mike Buss has pledged to keep on running as he sets his sights on the Arctic.

Most people would be happy with a century of marathons under their belt, but for the 36-year-old ex-Army soldier, who has pledged to raise £1 million for Help for Heroes, the challenge has only just begun.

Mr Buss, who ran three of his 100 marathons on a treadmill at RAF Lyneham, raising £34,000, said: “I am glad it’s over.

“Living out of hotels is not the most enjoyable thing to do. The toughest part is the day-to-day mundane routine.

“It makes me feel really good to raise all of that money. It is a lot for one person to raise.”

The former PE teacher completed his last marathon at the National Exhibition Centre in Birmingham on September 23.

In his bid to raise £1million for Help for Heroes, a charity which supports British servicemen and women, Mr Buss will be running up and down Snowdon as many times as he can without rest with a 40lb weight on his back.

This feat will be beaten by a 125-mile race in the Arctic in minus 40 degree temperatures, which is planned for March.

Days later, and with little time to acclimatise, Mr Buss will be swapping the extreme cold for extreme heat as he prepares to run 160 miles in the Sahara desert. To finish off 2011, Mr Buss will be embarking on a repeat of his 100 marathons in 100 days, but this time it will be in America’s Death Valley, facing temperatures of 50 degrees.

He said: “I am capturing the imaginations of people who think it is totally insane and impossible to do what I am doing, and then I prove them wrong and they give me lots of money for doing it.”

Mr Buss was medically discharged from the Army in 2007 after he was caught in a car bomb blast at the Lisburn Barracks in Northern Ireland.

If you would like to donate and support Mr Buss go online to www.bmycharity.com/ mikebussh4h or text 60777 to be in with the chance of winning a £17,000 Jeep.

Texts cost £5, which will be donated to charity, plus the standard network rate.