Guess the activity

Medical X-rays Round pneumonia in a 15 year pa...
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Let's see if you can guess the activity described in this article. (The key words have been taken out)

... is one of the most popular forms of ..., and it's easy to see why. The only equipment you really need is ... , and you can go for a ... just about anywhere. Plus, it's meditative, burns calories, builds your endurance and tones your body.
Many people find the activity addictive. You've probably heard of the so-called "... high".
... releases endorphins into the brain, and endorphins are responsible for mood changes. The harder you ... , the more endorphins released, and the giddier your "high." Some studies show that this endorphin rush allows people to continue ... even when injured.
And that brings us to the point of this article -- why people continue their ... even when they're sick. Most of us curl up in bed with some chicken soup and the remote control when we're under the weather. But ... do not. Are they helping or hurting themselves by ... with a cold? How do you know when it's OK to ... and when it's better to take off ... and climb in bed?
The best way to decide whether you should ... is to employ what doctors call the "neck check." Feel free to ... if your cold is "above the neck." Above-the-neck symptoms include:
Runny nose
Nasal congestion
Sneezing
Sore throat
Doctors advise against proceeding with ... if your symptoms are "below the neck," however. These symptoms include:
Chest congestion
Hacking cough
Nausea or upset stomach
High fever
Fatigue
Body and muscle aches

Some people think that ... in cold temperatures will actually make them sick. But this isn't really true. You can't freeze your lungs or windpipe. When the air is particularly cold, you may feel a burning in your chest as you inhale. If that's the case, try covering your mouth. That'll help heat up the air before you inhale. But if you have a simple head cold, it should be fine to ... , even if it's cold outside. The adrenaline ... provides can even help clear up a stuffy head.
(The article was taken from HowStuffWorks.com and edited a bit to make it hotter)
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