Be embodied

As a child, I felt disembodied.

My entire existence revolved around the power of my mind, and my fat and unhealthy body was merely a poorly designed avatar with which I interacted with the world.

But your body is important. Even if your existence revolves around the mind, you still need your body. It nourishes your intellect and protects it from harm.

So look after your body, and learn how to use it. Connect up neurons to all of the nerves that control movement, and learn how to coordinate them in complex patterns. And connect all of them - don't rely on your primary hand, someday you may need both at once or even just injure your primary hand. When you learn something on one side, immediately swap and learn it on the other.

Learn to pat your head and rub your tummy at the same time, and you'll get things done in half the time it takes others.

That skill was useful to me as a scientist (aliquoting liquids into fiddly little eppendorf tubes) and as a waiter (washing two glasses at once).

Learn to run and climb and fight, because you never know when that precious intellect of yours might be in danger.

And never, EVER let yourself believe that you can't have a healthy body because you are intelligent, geeky or academically minded.

TV has lied to you. The inverse correlation between physical strength and intelligence is not causative, and only a fool would doom himself to ill health in order to comply with a stereotype.