Until a year ago, Bernadette O'Brien, a retired principal who lives in northern New Jersey, did not make time for exercise. She would occasionally walk around her neighborhood and swim in the pool at her local gym, but she did little else.
After the 80-year-old was diagnosed with diabetes, she decided to change her habits. Now O'Brien exercises between 15 and 45 minutes a day, five days a week. She mixes up her routine with water aerobics and strength training so she won't get bored.
"I feel healthy and energetic. And my balance is pretty good," she said.
Lancet journal: http://www.thelancet.com
U.S. guidelines: http://www.cdc.gov/physicalactivity/everyone/guidelines/adults.html
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