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South Korean experts said on Tuesday they believe a vigorous gym exercise session caused a high-rise building in the capital to shake for 10 minutes this month, prompting hundreds to flee in panic.
They said tests showed that oscillations created by a group of Tae Bo practitioners on the 12th floor of the 39-story TechnoMart mall building apparently resonated through the structure.
Tae Bo is an aerobic exercise routine that involves performing the motions of boxing and martial arts such as Taekwondo at a rapid pace.
Professor Chung Lan of Danguk University in Yongin City near Seoul linked the incident to a physics principle under which catastrophic failures can occur when the vibration of a structure is matched by another source.
He told a radio programme that the building, constructed from iron girders and cement, had a characteristic vibration frequency which was 'in phase' with the synchronised movements of the Tae Bo practitioners,
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