Changing max life of unit?

Well, basically how do you change the max life of a unit (or prefferably unit type) using triggers? Like how cube does it for difficulty levels....

I don't know who Cube is but this is what you are looking for I think.
Player- Set Handicap

Handicap is basicly the percent of the units default max life that you want it to start with. Im not sure, but i think it does this for mana, just whatever handicap you choose it only has half effect on it.

Thanks, handicap works for my purposes.