It was a fitting finale for the Newcastle sports aerobics champion, who retired from competition after joining forces with student Siennah Pirona to secure a gold medal in the adult duo category at the FISAF International World Sports Aerobics and Fitness Championships in The Netherlands last month.

It came 15 years after Bull's first appearance at the world titles. She secured her first world crown in 2012 and since then the 29-year-old has gone on to be world champion eight times.

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Winning again, this time with Pirona, 18, was a "dream" finish.

"We won our first ever world championships in the same year," Bull said. "She won cadet individual at her first worlds and I won the senior one. This world title with Siennah was really special for me because she was my first athlete I took to worlds."

They progressed through the preliminary round then semi-final and there was a mix of emotions before stepping out for one last effort together.

"I did have a few little tears, just happy tears," Bull said.

"We both just had such a fun routine together and we really connected in the final one because we both knew this was it. We said, 'Let's just go out and have a blast', and we did."

Bull was honoured with a retirement presentation, which included her doing a display performance, on the final night of the world titles.

While mentally she feels she could keep competing, her body needs a long-earned rest. She has battled through injury for the past couple of years and it has been Bull's undying passion for the sport that has kept her in the sport sport so long.

"Siennah was so lucky; she won her first world championships when she was 11," Bull said. "For me, I was 21 or 22 and I started when I was 13 or 14, so it took me so long to be able to get my first one.

"When I first set my goal to be a world champion, I would never have thought back then I would do it eight times. But as soon as I won the first one it just gave me so much confidence. It was a new belief in myself. After that it was like I was just loving the sport more and more and I grew more confident. I just wanted to keep going and going until obviously my body couldn't let me."

Bull took seven other students to the world titles from her Gateshead studio, Newcastle Sports Aerobics. Stephanie Keily and Victoria Lee were second and fifth respectively in adult individual. Imogen Prentice, Blair Fisher and Ruby Sills were fourth in cadet trio. Sophie Herbert and Lateisha Pirona placed fourth in junior duo and the latter was fifth in junior individual.

She is now looking forward to turning her sole focus to coaching.

"I'm still going to stay fit and I still want to inspire my students," Bull said.

"I love being able to share my journey and what I've had to go through with them because I feel like as a coach if you haven't competed it's so much harder. The mindset and the challenges and the frustrations side of it, then the success side of it, I can explain all of them because everything they go through, I've already done it."