It really is all in your head: You have less endurance when your brain is fatigued. According to a study, a group of volunteers completed a complicated computer game, then performed a high intensity cardio workout until they were exhausted. On another day, they completed the workout after watching a boring DVD. The first time around, they quit the workout almost two minutes sooner than they did after the dull DVD-even though their heart rate and oxygen consumption stayed the same.
Why? Fatigue might affect areas of the brain responsible for your sense of effort. So go easy on yourself, and don'r schedule tough workouts on days you'll be taxing your brain.
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