Lifting your entire body horizontally off the floor in a straddle or pike, using nothing but your arms, is excruciatingly painful.
Even more challenging is making it look like you're having the time of your life, and doing it with a smile on your face.
It is a trick Bayfield High School pupils Danielle Galdeman and Georgia Henderson have perfected in the past month, and it helped them win the secondary teams year 9-13 novice event at the New Zealand national schools aerobics championships in Invercargill recently.
Danielle is also the 2011 South Island Athletics Championships 200m silver medallist, and Georgia is a ballet and jazz dancer, Astonishingly, four weeks ago, neither of them had any idea what competitive aerobics was.
The duo said they decided to give it a go, simply because "it looked like fun". And since then, they have trained every day after school, and spent their spare time practising the painful poses, even while watching television.
Former aerobics competitor and coach Jennah Booth was delighted with the result, especially considering the girls' inexperience in aerobics.
"Not bad for first-timers; not bad at all. We're very proud of them."
She believed their dedication to training was a major factor in their success.
Georgia also had individual success, winning the bronze medal in the individual female year 11-13 novice event, behind Queen's High School pupil Mai Nishitsuji, who won silver.
Queen's High School also featured highly in the national results.
In the individual female year 11-13 open novice event, Vyenna Pearcy won gold and Lydia Bernard won bronze, and in the individual female year 9 and 10 Novice event, Christina Ashton won silver.
