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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I have yet to meet a women who doesn't complain about her period. Goodness knows I have. We worry about it's arrival each month (admit it -- you've counted days on a calendar worrying about whether "it" will come during prom or your wedding or your beach vacation). But when it doesn't arrive like clockwork, that's worrisome in a whole other way. For women with irregular periods the question is usually "why?"

Researchers from four universities surveyed women and found that only 28% had perfectly regular cycles. The reasons for irregular periods vary. Here are just some of the possibilities:

• Late periods. If you're over 45 and your periods are stretching out for longer periods of time you might be perimenopausal. If you're under 45, talk to your doctor -- you may have a hormone imbalance.

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