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  • TODAY anchors roll up their sleeves and get their annual flu shots

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  • Early bird or night owl? Your sleep routine is genetic, study shows

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  • FDA approves new round of COVID-19 booster shots

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Why it’s never too late to get in shape: Dr. Natalie explains

02:39

A new study found that regular exercise can actually reverse years of bad habits. NBC medical contributor Dr. Natalie Azar tells Hoda Kotb and Keir Simmons that “a sedentary lifestyle will stiffen your heart.” She says high-intensity exercise can help reverse the effects of aging.