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Exercise

Exercise is safe, good for the brain, and a powerful antidote to depression and anxiety, both immediately and in the long term. "If you exercise on a regular basis, you'll have more self-esteem and feel healthier," says Drew Ramsey, MD, Assistant Clinical Professor of Psychiatry at New York-Presbyterian Hospital, Columbia University, who blogs at www.DrewRamseyMD.com.

"One of the major causes of anxiety is worrying about illness and health, and that dissipates when you are fit."

Next: The 21-minute cure