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Liz Summers, a 43-year-old personal trainer from San Diego, California, knows that exercising every day is a great way to stay in shape. But fucking is a great way to stay in shape, too. 'I went through an exploratory sexual time when I was in college then it slowed down as I got older and then married,' she said. 'I was loyal to my husband, and we had a normal amount of sex.