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proper warm-up and cool-down.

To help prevent injury, each time you participate in a vigorous activity, you should be sure to include a proper warm-up and cool-down.

To help prevent injury, each time you participate in a vigorous activity, it is important to include a proper warm-up and cool-down. A warm-up prepares your body for exercise by increasing your heart rate, warming up your muscles, and improving flexibility. This can be done through activities such as light jogging, stretching, or dynamic exercises specific to the activity you will be participating in.

To get the answer to this question, you simply need to look at the given options and identify the response that includes both a proper warm-up and cool-down. In this case, the option "proper warm-up and cool-down" is repeated twice, so it's likely the correct answer.