The Brain

Daily writing prompt

What is your favorite form of physical exercise?

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“Why Writing a Blog Might Be the Hardest Workout You’ll Ever Do”

Here’s a fun fact: your brain burns calories faster than your biceps. Even sitting perfectly still, that three-pound powerhouse in your skull chews through about 20% of all the energy your body makes — and that’s before you even start thinking hard. So, when WordPress asks about my favorite form of exercise, I can honestly say it’s writing a blog. Because when I’m deep in thought, chasing an idea, and wrestling with a sentence, my brain is basically doing squats.

The human brain is a full-time athlete. It runs on glucose, but when carbs are low — say, during fasting — it can switch to ketone bodies, the clean-burning jet fuel made from fat. That’s the beauty of it: the brain doesn’t quit; it just changes fuel sources and keeps firing away. That’s why, during my 20/4 fasting window, I often get a wave of focus that feels sharper than caffeine. My neurons are firing on ketones, and that mental engine hums like it’s running premium instead of regular.

So, while others might be out running 5Ks or benching iron, I’m at my keyboard doing cognitive deadlifts. Each paragraph is a rep. Each edit, a set. By the time I hit publish, my prefrontal cortex deserves a towel and a protein shake.

And yes — this workout burns real energy. Thinking, problem-solving, decision-making — it all takes metabolic power. Your neurons don’t just whisper ideas into existence; they fire thousands of electrical signals per second, using more oxygen and fuel than almost any other organ. That’s why creative work can leave you drained — your body isn’t tired, but your brain just ran a marathon in place.

So the next time someone asks me what my favorite form of exercise is, I won’t say jogging or yoga.
I’ll say:
“Writing. Because my brain doesn’t just think — it trains.”