Final answer:
The appropriate phrase to say out loud when thinking 'I'm thirsty' in Spanish is 'Tengo sed.' The word for 'lift weights' in Spanish is 'Levantar pesas.'
Step-by-step explanation:
The most appropriate phrase to say out loud when thinking ‘I'm thirsty’ is Tengo sed, which means ‘I am thirsty’ in Spanish. This phrase accurately expresses the feeling of being thirsty and can be easily understood by native Spanish speakers.
For the gym trainer discussing the benefits of lifting weights in Spanish, they should use the phrase Levantar pesas, which translates to ‘lift weights’. This term specifically refers to the action of lifting weights in a gym or fitness context.
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