The amount of sleep you get while you're pregnant not only affects you and your baby, but could impact your labor and delivery as
Answer:
Principles
Explanation:
"Specificity and progression" are two principles related to maintaining physical health. Therefore we can say that the word "principles" is the most suitable to replace the word "thing".
Also, "Specificity and progression" are neither exercises nor muscles. Nor are they acronyms, since an acronym is the word formed by joining letters or initial syllables of a group of words, pronounced as one word.
Planning ahead prevents stress. Not being stressed stops you from stress eating.