Walking every day is good, but more and more studies are proving the benefits of strength training for women of every age. Strength or resistance training not only results in a stronger, leaner body, but also offers enormous health benefits. It's not about lifting big weights or beefing up, just making sure you give all your muscles a good workout, especially those in your upper body. If you're not yet including strength training in your weekly workout, here are some great reasons to convince you to start.