How to check your health from a GUI?

I made a gui, and inside is a TextLabel which displays your health. However, I know that GUIs are in "Players" but health is inside "Humanoid" in your model in "Workspace." I did make a script, but I know it doesn't work.

while true do
    local n = script.Parent.Parent.Parent.Parent.Parent.Name -- TextLabel,Frame,ScreenGui,PlayerGui,Player
    local h = game.Workspace.n.Humanoid.Health
    script.Parent.Text = "Health:" .. h
    wait(0.1)
end

How would I actually do it?