Aerobic exercise
Learning Center
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.
Stress symptoms: Effects on your body and behavior
Learn how stress symptoms can affect your health so that you can take action.
10,000 steps a day: Too low? Too high?
Work up to a goal of walking 10,000 steps each day, depending on your starting fitness level, for numerous health benefits.
Aerobic exercise: Top 10 reasons to get physical
Need inspiration to work out? Consider the top 10 benefits of aerobic exercise.
Whole-body vibration: An effective workout?
Whole-body vibration — Don't give up regular exercise and a healthy diet.
Walking: Trim your waistline, improve your health
Walking can be an ideal low-impact exercise. Get the most from your walking routine.
Silent heart attack: What are the risks?
This type of heart attack occurs with few, if any, symptoms. Find out more.
Premature birth
Here's what you need to know about caring for a premature baby and the possible health problems of a preterm birth.
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