The duration of exercise and physical activity would depend on the capability and fitness goals of an individual. 2-3 hours of weekly physical activity can help you maintain a good healthy body. You can also include walking, swimming, running, or playing sports as a part of your workout routine. Absolutely. Walking is an easy workout that can help you maintain a healthy and fit body and mind. Brisk walking can help you lose weight faster. You can get indulged in any form of physical activity to achieve your fitness goals.