Final answer:
Physical fitness is the ability to perform physical activities without excessive fatigue, incorporating physical exercise to achieve energy homeostasis. Adults are advised to engage in a combination of moderate- and vigorous-intensity aerobic and muscle-strengthening activities throughout the week.
Step-by-step explanation:
The set of attributes that allow you to perform moderate- to vigorous-intensity physical activities on a regular basis without getting too tired and with energy left over to handle physical or mental emergencies is known as physical fitness. The 2018 Physical Activity Guidelines define moderate physical activities as those when you “can talk, but not sing, during the activity” and vigorous activities as those when you “cannot say more than a few words without pausing for a breath.” Achieving energy homeostasis is about finding the balance between the energy consumed from food and the energy expended in metabolism and physical exercise. It is recommended that adults do at least 150 minutes to 300 minutes a week of moderate-intensity aerobic activity, or 75 minutes to 150 minutes a week of vigorous-intensity aerobic activity, plus muscle-strengthening activities on 2 or more days.