[Dalzig]

Do your players come with a background in other RPGs? HP in a game like D&D is often described as more than injury. Luck, morale, energy, divine protection... usually just about anything except actually getting injured.

GURPS HP is straight up you are now bruised, broken, and/or have lost blood. It is usually a literal interpretation of how many holes can be poked in you before you die.

I don't really see HP being based off of HT. Think of a marathon runner. Fit but thin. Lowish ST but high HT. They just don't have the meat on their bones to really sustain major amounts of injury. When they do, they tend to spring back fast thanks to their fitness.