Final answer:
The loss of fitness through rest or injury is known as deconditioning. Deconditioning can happen when you take a break from your regular exercise routine or when you are injured and unable to engage in physical activity. The effects of deconditioning can be reversed through proper exercise and gradual return to physical activity.
Step-by-step explanation:
The loss of fitness through rest or injury is known as deconditioning. When you do not exercise or engage in physical activity, your body loses its conditioning and becomes less fit. This can include a decrease in muscle strength and endurance, cardiovascular fitness, flexibility, and overall physical performance.
Deconditioning can happen when you take a break from your regular exercise routine or when you are injured and unable to engage in physical activity. It is important to note that the effects of deconditioning can be reversed through proper exercise and gradual return to physical activity.