Weight machine exercises
Learning Center
Video: Heart and circulatory system
Watch this video to see how a healthy heart works.
Video: Chest press with weight machine
The chest press exercise targets the chest muscles. See how it's done.
Video: Biceps curl with weight machine
The biceps curl builds strength in the upper arm. See how it's done.
Video: 3 things you didn't know about cold sores
Cold sores on the lips can be embarrassing and tough to hide. Most people who are infected with the virus that causes cold sores never develop symptoms.
Vertebral tumor
Learn about these tumors that grow in the bones of the spine, causing pain and weakening the spinal column. Find out about diagnosis and treatment.
VLDL cholesterol: Is it harmful?
Like LDL cholesterol, very-low-density lipoprotein (VLDL) cholesterol is considered a type of 'bad' cholesterol.
Types of psoriasis
Learn to identify types of psoriasis, such as guttate psoriasis and scalp psoriasis, by appearance.
Types of dermatitis
Learn to identify types of dermatitis by how the skin looks. Examples include atopic dermatitis, contact dermatitis and seborrheic dermatitis.
Triglycerides: Why do they matter?
Like cholesterol, triglycerides can cause health problems. Here's how to lower your triglycerides.
Transgender facts
Know the basics about sex and gender, including common terms and definitions.
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