Fitness basics
Learning Center
Sudden death in young people: Heart problems often blamed
Sudden cardiac death in young people is rare. It's not the same as sudden cardiac arrest. Learn about the risk factors and causes and when screening is needed.
Stuttering
Stuttering, sometimes called stammering, is a speech condition that involves problems with rhythm and flow when speaking.
Stress and high blood pressure: What's the connection?
Discover how relaxation and exercise can improve your blood pressure numbers.
Strep throat
Learn more about the symptoms, causes and treatment of this throat bacterial infection in children and adults.
Strength training: OK for kids?
It's good for kids to build strength as long as form and safety come first.
Strength training: Get stronger, leaner, healthier
Strength training can help you look good — and feel even better.
Stereotactic body radiotherapy
This type of radiotherapy uses highly targeted radiation beams to treat tumors in all parts of the body.
Standing forward bend
Relax with this yoga pose and stretch your back and legs.
Stage 4 prostate cancer
Find out about diagnosis and treatment of this cancer that has spread to the lymph nodes or other parts of the body.
Spirometry
This common test shows how well your lungs work and helps diagnose conditions that affect the ability to breathe.
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