You are born into life with a full health bar.
And another bar that is, in my eyes, a tolerance level. The tolerance you have on life's attacks. Sadly its different among different people.
Life is a very strong powerful enemy who you verse for a long time. Life has many different attacks that vary in power. Life is a immortal being.
[Algol from Soul Calibur IV]
Your health bar slowly deteriorates from Mental, Physical, and Emotional damage. The tolerance damage is determined by what kind of attacks life uses against you. Life is a giant Versus Video game you have to fight against even though Life is immortal.