The poet Joseph Addison once said that "reading is to the mind is what exercise is to the body" — and multiple studies have shown that cracking open a book can sharpen your focus, reduce stress and help you sleep better.

Emily Ballesteros, a burnout management coach in Seattle, considers reading to be her favorite act of self-care. "It encourages you to slow down, and focus on one thing," she tells CNBC Make It. "It's almost impossible to read a book while you're doing the dishes, for example – you have to give it your full attention, and I love that."