"Being on the pre-competition diet was a real challenge, because we had to source the kind of diet we were on before competition," Thomas said.
"We had to go out and find places to cook it for us, then take it back to the hotel.
"There was a gym at the hotel, which we made use of, and did our cardio training up the hill in the hotel complex."
At the event, it was a proud moment to march in the parade as a team before the event amongst 141 athletes from 21 countries.
Thomas then had to settle into the task of competing in the Women's 35+ division, a big ask for the Wanganui woman in her 50s to go against a number of younger competitors representing France, Hungary, Italy, the United Kingdom and Cyprus.
"It was just amazing, world-class. It was awesome to be on the stage.
"Everything was much larger scale the venue, the stage, the sound effects, the big screen behind the competitors."
Now back home and returned to her regular routine at Wanganui's Club Fitness, Thomas has her immediate sights set on the National Amateur Bodybuilders Association (Nabba) nationals in Auckland this October.
Next year the Nabba Asia-Pacific championships are in Fiji while the world championships are in Spain.
"You do get a real buzz from competing on stage, I would love to compete overseas again."