Free weights
Learning Center
Video: Biceps curl with dumbbell
The biceps curl builds strength in the upper arm. See how it's done.
Video: Triceps extension with dumbbell
The triceps extension targets the back of the upper arm. See how it's done.
Video: Chest press with dumbbell
The chest press exercise targets the chest muscles. See how it's done.
Video: Biceps curl with barbell
The biceps curl builds strength in the upper arm. See how it's done.
Video: Reverse fly with dumbbell
The reverse fly exercise targets the upper back. See how it's done.
Video: Bent-over row with dumbbell
The bent-over row targets the back of the shoulder. See how it's done.
Video: Calf raise with dumbbell
The calf raise targets the calf muscles in the legs. See how it's done.
Video: Squat with dumbbell
The squat is an exercise that targets the leg muscles. See how it's done.
Keratoconus
When your cornea bulges outward, it can cause blurry vision and make your eyes sensitive to light. Find out about symptoms, causes and treatment for this eye condition.
Narcolepsy
Learn more about this sleep disorder that causes periods of involuntary sleep, sleep paralysis and early rapid eye movement (REM) sleep.