TTrue, exercising too much can cause t]you to feel light headed, nauseous, or even make your body shut down. ( it happened to me during a softball game)
The human skull is one of the thinnest bones in the human body and is not meant for supporting very much weight or for absorbing shock like a human femur, tibula, or fibula.
the rounded shape of the skull is meant to hold a brain while the cylindrical shape of a "leg bone" is made for support and shock absorption.