What is the motivation for not bending your arms? (Honest question)
In Sosenka's case, it was that doing 150 laps of the track was going to be tiring due to the acceleration ("g-force") through the corners. They calculated* that the extra drag of nearly straight arms would be offset by the ability to hold a better body position throughout the whole hour. Can't speak for the other bloke, maybe he has a disability.
*It seems that they calculated a lot of other things too, it was 2005 after all.
In Sosenka's case, it was that doing 150 laps of the track was going to be tiring due to the acceleration ("g-force") through the corners. They calculated* that the extra drag of nearly straight arms would be offset by the ability to hold a better body position throughout the whole hour. Can't speak for the other bloke, maybe he has a disability.
*It seems that they calculated a lot of other things too, it was 2005 after all.