Aerobic exercise
Learning Center
Teen suicide: What parents need to know
Understand what makes teens prone to suicide, and learn what you can do to prevent it.
Aerobic exercise: How to warm up and cool down
Learn how to warm up and cool down the safe way.
Easy bruising: Why does it happen?
Get the facts about easy bruising. Learn about causes and find out when it's a sign of a problem.
Aging: What to expect
Understand the natural changes that come with aging.
Alzheimer's genes: Are you at risk?
What role do genes play in developing Alzheimer's? Are you at risk?
Exercise intensity: How to measure it
To get the most out of exercising, aim for moderate to vigorous exercise intensity. See how to judge your exercise intensity.
Smokeless tobacco products
Learn the risks of using products such as chewing tobacco, snuff and snus.
Walking: Make it count with activity trackers
If walking is your main form of physical activity, see how activity trackers can help you set and achieve your fitness goals.
Alzheimer's stages: How the disease progresses
Alzheimer's stages — common behaviors as the disease progresses.
Stress symptoms: Effects on your body and behavior
Learn how stress symptoms can affect your health so that you can take action.
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