All types of physical activity deliver health benefits. For seniors, a daily walking routine is often the best option. Harvard Medical School cites various studies that have confirmed that walking counteracts the effects of weight-promoting genes, reduces cravings for sweets, eases joint pain, and boosts immune function. Achieving these benefits may require only 20 minutes of walking a day, five days a week. To gain even more from your walks, take them outdoors, with or without a friend. These short bursts of activity can improve your mental outlook in addition to your physical health.