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Mayo Clinic staff — You know core exercises are good for you — but do you include core exercises in your fitness routine? Here's why you should.

Centers for Disease Control and Prevention — Calculate your target heart rate for a safe and effective workout.

Mayo Clinic staff — Functional fitness exercises train your muscles to help you do everyday activities safely and efficiently. Find out more about functional fitness exercises — and what they can do for you.

Mayo Clinic staff — Are you stocking a home gym? Or simply hoping to add variety to your fitness routine? A fitness ball might be the ticket. See how fitness balls are used.