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4. The principle of specificity refers to the concept that improvements in the various fitness areas require specific kinds of activity,
O False
True

Habit 1: be proactive  habit 2: begin with the end in mind  habit 3: put first things first  habit 4: think win-win  habit 5: seek first to understand, then to be understood  habit 6: synergize  habit 7: sharpen the saw 

Stimulants speed up the central nervous system.