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It’s true that many ADHD kids are more active than their peers—studies show they have less body fat, on average—and I see plenty of adults with ADHD who are already exercising. But they need to be doing more, and on a regular basis. In general, I tell my patients to make every effort to institute a regimen of daily exercise—or at least during the five weekdays, when they need to focus at school or work. Dishman’s study suggests that submaximal exercise, which would be 65 to 75 percent of maximum heart rate, is more effective with girls, while more vigorous exercise (just below the anaerobic threshold, which I’ll explain in chapter 10) works better for boys. We don’t really have parallel data for adults, but from what I’ve seen, it’s important to get the heart rate up there—maybe 75 percent of your maximum for twenty or thirty minutes. For ADHD in particular, the complex, focus-intensive sports such as martial arts and gymnastics are a great way to tax the brain. By engaging every element of the attention system, it holds you rapt. These sports are just more interesting than running on a treadmill, and participation tends to be self-perpetuating—it’s easier to stick with
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John J. Ratey (Spark: The Revolutionary New Science of Exercise and the Brain)