Strength training
Learning Center
Low sperm count
Having a low sperm count can make conceiving a child difficult, but not necessarily impossible. Learn about possible causes and treatment.
Low potassium (hypokalemia)
Low potassium (hypokalemia): Symptom — Overview covers what can cause this blood test result.
Loss of sex drive in men: Natural with aging?
Age-related loss of sex drive is normal, but sometimes an underlying condition is at play.
Liver cysts: A cause of stomach pain?
Occasionally, liver cysts can cause pain and discomfort in the upper abdomen.
Livedo reticularis: When is it a concern?
Learn when this condition that causes a lacy pattern on the skin is simply a result of being chilled or something more serious.
Learning disorders: Know the signs, how to help
Here's how to find out what's going on if your child often has trouble with reading, writing or other skills.
Klinefelter syndrome
This genetic disorder occurs when a male is born with an extra copy of the X chromosome and may result in low testosterone production and infertility.
Kidney pain
Find out how this type of pain may feel and what health problems can cause it.
Kegel exercises for men: Understand the benefits
Men benefit from Kegel exercises too. Follow these tips to strengthen your pelvic floor muscles.
Isometric exercises: Good for strength training?
Learn more about isometric exercises that contract a particular muscle or group of muscles.
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