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"The match was postponed for today and it wasn't too early so it was OK to get some sleep. I didn't go to bed until 2.30am so it disrupts your body rhythm - so I'm just happy to come through."

“Typically, you’re practicing earlier in the day for when you’re kicking off at 1 o’clock out here. There’s just a different element of what your natural body rhythm goes through.”

“No question it does, because you’re out of your body rhythm, your rhythm of you’re used to playing at 7, 7:30,” he said.

Other names used for the classes have included “body rhythm,” “advanced aerobics” and “Mumba.”

“I feel wonderful — the body rhythm and the music in background are fascinating,” she said.