When you move your arms in virtually any direction, your shoulders (a.k.a. deltoids) are either in charge or, at the very least, involved. The ingenious design of your shoulder joints makes the shoulders one of the most mobile, versatile muscle groups in your body. It also makes it one of the most vulnerable. Fortunately, if you commit to doing some basic shoulder training on a regular basis you'll keep your "delts" strong and supple and have a better chance of staying injury-free. It'll help balance out your body's curves too. Want to slim your hips? Chiseled shoulders broaden the upper body and polish your posture, creating the illusion that you've shrunk and reshaped your hips. Plus, firmed up shoulders look killer in tank tops. To get your shoulders in shape, try exercises.

Click through the photo gallery below for our step-by-step workout guide.




Ideally, you should own three sets of dumbbells for shoulder work; typically 3, 5 and 8-pounders. When you first try the accompanying shoulder routine, start with your lightest weight. Do 1 set of each move, 8 to 15 sets per set, 2 to 3 times a week. Once you can easily complete 15 reps of an exercise, move up to the next heaviest weight or try the "challenge yourself" version. Rest assured that going heavier won't bulk you up -- we promise. On the contrary, it'll help you shape, tone and strengthen your shoulder muscles a lot quicker than sticking with a weight that's too light to have an impact.

Mistakes to avoid: Don't arch your back as you lift and keep the movement in control so you don't rock back and forth to help lift and lower the weight. To avoid shoulder and neck pain, don't clench your teeth, hitch your shoulders up, or drop your chin to your chest. Keep these technique pointers in mind and you'll create a beautiful pair of shoulders with minimal risk of doing any damage. (If you tend to have chronic shoulder pain, consult with your doctor or physical therapist before you do these moves.)

Shoulders benefit from a bit of variety so change up your routine every month or so by doing 1 to 2 workouts with exercise bands or by tossing in a set or two on the shoulder press machine at the gym. Yoga is surprisingly good at toning and redesigning shoulders because so many upper body poses depend on them to move and support the entire body. Swimming, especially the crawl stroke, is also a good shoulder shaper.