Dr. Thienna Ho
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American Dr. Thienna Ho performed 222 squats in one minute on December 8, 2007, in San Francisco, setting a Guinness World Record. That pace -- roughly 3.7 squats per second -- demands extreme lower-body strength and cardiovascular capacity while maintaining proper form throughout. A fitness expert and author, Dr. Ho stated she undertook the challenge to promote the importance of healthy lifestyle habits.