Working and training in Northern Ireland in the early 1970s meant training for the Olympics was far different for me than for many other athletes.
When I was preparing for the 1972 Games in Munich, I was living at the north end of Belfast and I had to travel, with my shot put and starting blocks in hand, on a bus all the way to the other side of the city. There would often be bombs going off but I didn't know any other life; I just got on with it.
As the Munich Games got closer, however, I was fortunate enough to be able to leave Northern Ireland and, supported by the Churchill Fellowship, train for six weeks in America. It took me away from the Troubles and to a completely new environment and climate.
My pentathlon finals were played out over two days at the '72 Games. I was competing against the West German athlete Heide Rosendahl. She was not only the favourite, but she was also appearing in her home city. So I knew I had to do something special and I really think my time in the sport – I was the most experienced athlete in my competition at 33 – paid off for me. The competition was split in two halves. I managed to achieve personal bests in the first three events – the 100m hurdles, the high jump and shot put. But I knew Heide's strongest events were the final two: the 200m and the long jump.
Despite the pressure of the events, it was the waiting around that was the worst thing for me. The break in the afternoon was awful, all I could think to do was to go back to the Olympic Village. It was only between noon and 6pm but it felt like I was there a year.
I had a cushion of something like 100 points going into the penultimate event and I ended up with a fairly average long jump. Heide then leapt 6.83m – one centimetre short of her world record. I knew then that the only way I could get Gold was to run a personal best in the sprint.
We flew out of the blocks and Heide finished 10 metres ahead of me. But the pentathlon is not about positions, it's about points. And we had to wait anxiously while the computer churned out the results.
When I realised I'd won gold, there was a wonderful feeling. She had finished in 22.96sec. I was 1.12sec further back, it was a new personal best and it was enough. I had the gold. I finished with 4,801 points – a new world record. Because of my age, I knew it was my last Olympics but what made it really special wasn't the win, but the news that my father had come over from Australia to watch. I hadn't seen him for five years and I saw him tell the BBC that he'd been watching me; I was so pleased to see him. I could see he was proud.
I left the Games with four personal bests out of five finals events and I believe that my experience had helped me build up the confidence I needed.
My life changed dramatically after Munich. Like almost all the athletes at the time, I was an amateur so I was also working as a home economics teacher. But after bringing home the gold I had the chance to help so many people in so many ways. I set up the Mary Peters Trust and we still celebrate my win at home in Northern Ireland. We're holding a party to commemorate the anniversary this year.
The Mary Peters Trust offers financial aid to young people trying to succeed in sport. www.marypeterstrust.org
Golden girl: Mary Peters factfile
Born 6 July 1939 Halewood, Lancashire but moved to Ballymena aged 11. She now lives in Lisburn just outside Belfast
Olympic record In the 1972 Games she won gold in the pentathlon, having finished 4th in 1964 in Tokyo and 9th in 1968 in Mexico. She represented Northern Ireland at every Commonwealth Games between 1958 and 1974. In those Games she won two golds in pentathlon, plus a gold and silver in the shot put.
Honours She was made a CBE in 1990, having been appointed MBE in 1972. In 2000 she was appointed Dame Commander of the Order of the British Empire.