The answer is exercise and recreation. Milady states directly, as part of its study-habits guidance: remember that exercise and recreation stimulate clear thinking.
The book pairs this reminder with a related tip — schedule at least one block of free time each day — treating rest and physical activity as genuine study tools, not distractions from studying. Note taking, key words and phrases, and repetition are all separate study techniques covered elsewhere in the same chapter, just not the ones tied to clear thinking specifically.
Milady Standard Barbering, 6th ed., Ch. 2 (Life Skills), p. 31: "Remember that exercise and recreation stimulate clear thinking."
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