Final answer:
Hydrotherapy is a physical measure used in non-pharmacological pain relief through water-based techniques.
Explanation:
Hydrotherapy is considered a physical measure used as a non-pharmacological method of pain relief. It involves the use of water, such as hot baths or pools, to alleviate pain and promote relaxation. This therapy can be particularly beneficial for individuals experiencing musculoskeletal pain or seeking relief from tense muscles.
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