context: How to run a fast half mile
Build endurance.
Before you build speed, you need to build the endurance that will let you run the full half mile. Add sprinting into your regular running regimen to start building endurance.
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next sentence for the context: Start with smaller distances, such as 100-meters, and work your way up. You might also start at 200 or 400 meters, depending on your experience.

context: Two men are crouched on the ground outside a bike path. they
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next sentence for the context: are working on a broken down bike.

context: Man is kneeling in a corner of a room purring cement on the floor with a spatula. two women
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next sentence for the context: are watching the men working on the floor.

context: How to exercise when you have a cold
Check where your symptoms are.
When you have a cold, there are only certain symptoms with which you can exercise. If your symptoms only affect parts of your body above your neck, you are safe to work out.
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next sentence for the context:
Working out may actually help open your nasal passages. If your cold symptoms affect any body part below the neck, you should not exercise and instead rest.