Crossing your arms across the chest and pulling the knees up to your chest is how the HELP position is achieved.
What is HELP position?
This is referred to as heat escape lessening position and reduces heat loss in individuals when in cold water.
This position helps to protect groin, head/neck, and rib cage/armpits areas of the body.
Read more about Heat loss here https://brainly.com/question/6850851
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