A new study published in the Journal of the American Medical Association showed that exercising for just 10 minutes a day can help overweight and obese women with high or borderline-high blood pressure reduce their risk of early death. The study looked at 427 women and found that all of the women who exercised had smaller waists at the end of a six-month period, which is important as women with waist sizes bigger than 35 inches have a heightened risk of early death.