Kohei Uchimura is trying to put fitness concerns out of his mind ahead of his quest to become the first gymnast to win three consecutive individual all-around titles at the upcoming world gymnastics championships.

The Japanese men's team rehearsed Wednesday at Tokyo Metropolitan Gymnasium but Uchimura had to stop in the middle of his floor exercise, the second-to-last discipline due to cramps in both legs.

"I felt discomfort in both calves," said Uchimura, who went on to complete the pommel horse.

"My muscles got weakened after I twisted my right ankle (in September), and I guess my body is a bit tired after intensive training for the championships. But I'll try not to care about all those things."