When exercising in the heat, you should a. wear tight-fitting clothes to absorb your sweat b. dress in layers c. choose dark colored clothing d. vary the intensity and duration of the exercise

I believe the answer is: D. vary the intensity and duration of the exercise

The variations of intensity and duration considered as the most effective means of protecting health against thermal strain, These variations help our body to invoke physiological adaptation so we can obtain maximum heat loss mechanism.

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