Core exercises
Learning Center
Scarlet fever
Learn more about the symptoms, causes, complications and treatment of this strep bacterial infection that causes a red rash, sore throat and high fever.
Testicular torsion
Sudden, severe pain in the scrotum could be testicular torsion. Learn about symptoms and treatment for this health emergency.
Traumatic brain injury
If a head injury causes a mild traumatic brain injury, long-term problems are rare. But a severe injury can mean significant problems.
Whooping cough
Learn more about the symptoms, causes, treatment of this highly contagious, vaccine-preventable lung infection.
Video: Fitness ball bridge with heel dig
Comfortable with the fitness ball bridge? See how to add a heel dig.
Video: How to choose a fitness ball
A fitness ball is versatile, but it's not one-size-fits-all. See your options.
Video: Squat and reach with fitness ball
You can do many exercises with a fitness ball. See the squat and reach.
Video: Abdominal crunch with fitness ball
You can do many core exercises with a fitness ball. See the abdominal crunch.
Video: Bridge with fitness ball
You can do many core exercises with a fitness ball. See the bridge.
Video: Plank with fitness ball
You can do many core exercises with a fitness ball. See the plank.
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