1. involves taking air into the body and releasing air into the environment. Breathing
or

Respiration?

Should be breathing.
Respiration is more of a chemical process that turns oxygen into carbon dioxide.
Breathing is the action of taking in air

The talk test measures ease of speaking during exercise;

The answer you're looking for is washing your hands. "at this late date, we all expect our doctors to wash their hands before examining us or performing an operation in order to prevent the spread of infection. surprisingly, physicians did not begin to acknowledge the lifesaving power of this simple act until 1847.it was then that dr. semmelweis began exhorting his fellow physicians at the famed vienna general hospital (allgemeines krankenhaus) to wash up before examining women about to deliver babies. his plea was far more than aesthetic; it was a matter of life and death and to prevent a deadly malady known as “childbed” or puerperal (from the latin words for child and parent) fever."