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The best physical activity routine is one that includes the four pillars of fitness: flexibility and stability, endurance-building activities (aerobics, walking), strength training, and balance. Stretching helps keep your muscles stretched, which improves your flexibility or ability to lean / bend your body without hurting yourself. Frequent stretching can allow you to gain mobility, making it easier for you to bend over / bend over and reach for items in cupboards, according to Jay Blahnik, a fitness specialist and author of the book A New Stretching Method for Everyone.