Nearly 44 million people in the U.S. are living with osteoporosis. The disease, which causes bones to be thin and brittle, strikes women more often than men. It's never too early to make the lifestyle changes that will help develop strong bones:

• Weight-bearing activity. Exercises such as walking, jumping rope, and jogging help build bone. Strength training is also important for bone health.
  
• Calcium. Eat a diet rich in calcium and be sure to get appropriate amounts of vitamin D (through sun exposure and fortified foods -- supplements are also available).
  
• Salt. Limit salt intake as it causes your bones to excrete more calcium.
  
• Break bad habits. Smoking can be bad for bone health as can drinking alcohol and drinking soda.

Check out the gallery for age-specific bone health recommendations.

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Fitness is important at any age -- it keeps your body looking and feeling good, it helps prevent a host of chronic conditions, and it boosts your energy. But as you approach the big 4-0, there are some additional reasons why exercise is important.

Exercise helps alleviate some of the symptoms of perimenopause, which can begin anytime during your 40s. Exercise is also a proactive measure against the estrogen loss that will occur later during menopause; it can help prevent related problems such as bone loss. Menopause may seem far away -- but being active now will make it easier when menopause comes knocking on your door.

Revolution Health has fitness tips for women in their 40s:

• Increase your core strength, balance, and flexibility. Improving these areas and maintaining them will help prevent falls and stiff, achy joints as you get older. Activities such as Pilates and yoga will help. AOL Health has tips on strength and flexibility exercises.
• Do weight-bearing exercise. Bolster your bone density by participating in weight-bearing activities such as jumping rope, aerobics, tennis, and jogging.
• Keep up the cardio. Cardio workouts will help keep your heart strong and help you maintain a healthy weight.

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Not too long ago, I wrote about a workout More Magazine had specifically for women over 40. Now, some More Magazine readers have stepped forward to show that they're over 40 and fitter than they were in their 20's.

Some of their tips:

• Manage stress eating by making healthier, conscious choices.
• See a trainer to develop a strength training routine.
  
• Limit red meat and eat more fruits and vegetables.
• Exercise daily.
• Shove self-doubt to the side and don't shy away from a challenge.
• Try a new activity.
• Even if you have a hectic schedule, be sure to take time to focus on yourself. Treat your health like the priority it is.
• Practice weight-bearing exercises to maintain healthy bone density.

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