Which of the following exercise program variables describes a change in intensity?

Question

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Increasing a treadmill incline by five degrees will require more effort from the muscles, resulting in an increase in intensity. Changing activity from treadmill to stair-stepper may also result in a change in intensity, but it is not necessarily a variable within the same exercise program. Increasing the number of workout days or the duration of the workout may also impact overall intensity, but they do not necessarily describe a change in intensity within a single exercise session.

Which of the Following Exercise Program Variables Describes a Change