Resistance training may be the single most effective way to lose fat and look great in a swimsuit. Adam Campbell, author of The Women's Health Big Book of Exercises, gives 20 reasons you should lift weights.

Try this new workout from Adam Campbell, author of The Women's Health Big Book of Exercises. It works every inch of your body, from every direction, for a complete total-body workout that'll help you finally shed those last few hard-to-lose pounds.

Want to look better in a swimsuit? Try this cutting-edge, fat-burning workout that uses moves from The Women's Health Big Book of Exercises.

Is a clock ticking on your life? Dr. Oz reviews the 5 biggest health mistakes women make and the dangerous warning signs you must never ignore.

Marie Osmond opens up about her lifelong weight struggle and finally finding success with NutriSystem.