Exercise in a nut-sack:
Obtain a small hand towel
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Wet this hand towel using warm/hot water.
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Place the hand towel around your penis.
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Wet the towel again to keep the warmth.
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Leave the hand towel on the penis for 2-3 minutes.
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Temporary discard of the towel and perform workout.
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When workout is finished re-heat the towel.
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Apply the towel to the penis for another 2-3 minutes.