Chung and six others re-created the scenario which caused the panic on July 5 -- with a group of 17 middle-aged people working out to the tune of a pop song, "The Power" by German group Snap -- and said the building shook in a similar way。

On the first occasion hundreds fled the building as it shook for about 10 minutes. The Gwangjin district government ordered the mall closed but reopened it after experts said it was structurally sound。

The gym remains off-limits。

Cho Byung-Joon, chief of the district government's flood control and disaster prevention division, said the professor and other experts would carry out a test before news media and officials later Tuesday to prove their theory。

"When they show the test results to us and with data, we will immediately let people use the fitness club," he told AFP. "But practising Tae Bo in that particular building may have to be banned."

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