Elastic resistance
Learning Center
Vitamin D deficiency
What are the risks of too little vitamin D?
Vitamin B-12 and depression: Are they related?
Low levels of vitamin B-12 and other B vitamins may be linked to depression, but more research is needed.
Video: What happens during obstructive sleep apnea?
Sleep apnea — Watch this video to see how snoring and obstructive sleep apnea occur.
Video: Triceps kickback with resistance tubing
The triceps kickback targets the back of the upper arm. See how it's done.
Video: Standing hip abduction with resistance tubing
The standing hip abduction exercise targets the hip muscles. See how it's done.
Video: Squat with resistance tubing
The squat is an exercise that targets the leg muscles. See how it's done.
Video: Smoking — Anatomy of nicotine addiction
This animation illustrates how smoking changes your brain, causing nicotine addiction.
Video: Seated row with resistance tubing
The seated row targets the muscles in the upper back. See how it's done.
Video: Keratoconus
Scleral contact lenses may be an alternative to surgery for many patients with keratoconus.
Video: How to choose resistance tubing
Resistance tubing is a lightweight, portable strength training tool. See how it's used.
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