<span>Body's ability to endure 20 minutes or more of strenuous, continuous exercise
-with oxygen
-heart becomes stronger and more efficient
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</span><span>Aerobic exercise</span>
The independent variable is the exercise program (high vs low)
The dependent variable is what they are measuring so it would be the subjects stamina. The dependent variable is measured by how long they can walk comfortably on a treadmill (at the end of the program).
