Body weight exercises
Learning Center
Urinalysis
This common lab test checks urine for signs of disease and for clues about overall health.
Vaginal agenesis
In this rare condition that occurs before birth, the vagina doesn't develop and the uterus may only develop partially or not at all. Learn about treatment.
Vascular rings
Learn more about this condition in which malformations of the aortic arch encircle the windpipe and esophagus and can press against them.
Ventricular fibrillation
Without fast treatment, this heart rhythm problem can cause death within minutes. Learn the symptoms of VFib and what actions to take to save a life.
Video: Abdominal crunch
The abdominal crunch is a classic core-strength exercise. See how it's done.
Video: An asthma attack
What happens to your airways during an asthma attack?
Video: Keratoconus
Scleral contact lenses may be an alternative to surgery for many patients with keratoconus.
Video: Lunge exercise
The lunge is an exercise that targets the leg muscles. See how it's done.
Video: Modified pushup
The modified pushup is less challenging than a classic pushup. See how it's done.
Video: Squat exercise
The squat is an exercise that targets the leg muscles. See how it's done.
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