Fitness basics
Learning Center
How well do face masks protect against COVID-19?
Face masks can help slow the spread of coronavirus disease 2019 (COVID-19). Learn about mask types, which masks to use and how to use them.
How fit are you? See how you measure up
Determine your fitness level with this simple fitness assessment.
High blood pressure and pregnancy: Know the facts
Concerned about high blood pressure during pregnancy? Find out what you can do to reduce your risk of complications.
Herd immunity and COVID-19: What you need to know
To protect groups of people over time, it helps to know what level of recovery or vaccination in a population makes it hard for a germ to spread.
Helping children cope: Tips for talking about tragedy
Helping children cope with tragedy isn't easy. Consider practical ways to support your child.
Heat and exercise: Keeping cool in hot weather
Use these tips to avoid problems when exercising outdoors in hot weather.
Heartburn or heart attack: When to worry
Chest pain? Learn the potentially lifesaving difference between heartburn and a heart attack.
Heart attack symptoms: Know what's a medical emergency
Watch for these heart attack symptoms.
Healthy sperm: Improving your fertility
You can take simple steps to have healthy sperm and improve your fertility.
Hand-washing: Do's and don'ts
Done properly, hand-washing is a simple way to prevent the spread of germs and avoid getting sick.
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