If you are suffering from gym-phobia, don’t despair. Going out for a 30-minute walk every day will suffice. Keeping your body moving is what’s important, not so much where or how. Short walks every day, a study says, can slow down your physiological age by several years. Another research suggests that these half-hour walks can add seven years to your life. Federal guidelines for adults recommend at least 2.5 hours of walking (at the very least)a week.