by Charles Stone

I’ve given over 1,000 talks, sermons, speeches, and Bible studies during my 33 years in ministry. Sometimes I’ve felt like my mind was in the zone. Sometimes I didn’t. Only in the last few years have I discovered perhaps the single greatest key that has helped keep my mind sharp during a talk and improve its effectiveness. What was it? Exercise. Specifically, exercise within two to three hours of my talk. Here’s what I’ve learned about the brain and exercise that has improved my speaking.

Scientists increasingly see exercise as a powerful way to keep your brain healthy. Neuroscientist Dr. John Ratey wrote an entire book on the subject called SPARK, The Revolutionary New Science of Exercise and the Brain. He explains that exercise increases a key protein necessary for a healthy brain, BDNF (brain derived neurotropic factor). Brain derived means that the brain makes it and neurotrophic implies that it helps make neurons (brain cells) strong. It’s considered the master molecule of learning (Ratey, p. 38) that he calls ‘Miracle-Gro for the brain.’

This brain fertilizer benefits the brain in many ways.

  • It protects neurons from premature death.
  • It improves their function.
  • It enhances communication between them.
  • It stimulates their growth (neurogenesis).
  • It provides a key link between emotions and thoughts (Ratey, 2013, p 40).

In one study Dr. Ratey writes about neuroscientist Arthur Kramer who divided fifty-nine sedentary senior adults into two groups (p. 226). One group simply did stretching exercises for six months while the other group exercised for six months three times a week on a treadmill. MRI scans showed that their frontal and temporal lobes actually increased in volume, a surprising finding. And, their brains looked two to three years younger than the brains of the stretch only group.

Another study showed that even one 35-minute workout on a treadmill at 60-70% of maximum heart rate can improve our brain’s processing speed and cognitive flexibility. Cognitive flexibility is a term that describes your brain’s ability to shift its thinking and to create new ideas.

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