Animation ID change with health value changes will not work! Help?

I've been following this tutorial here:https://www.youtube.com/watch?v=dKytA5tz-0Q, I tried to edit it so that animations would change if the health was at a specific value or less but it won't work, even the original script that was used in the video wouldn't work.

Here's the code, by the way this was put into a script and thrown into ServerScriptService with FE disabled, like the video showed.

game.Players.PlayerAdded:Connect(function(plr)
	local char = plr.CharacterAdded:Wait()
	while true do
		if char.Humanoid.Health >= 70 then
			print("health at 100")
			char.Animate.Idle.Animation2.AnimationId = "rbxassetid://5980688357" --these animation id's are test animations, they aren't supposed to be actual animations.
		elseif char.Humanoid.Health <= 50 then
			print("health at 50")
			char.Animate.Idle.Animation2.AnimationId = "rbxassetid://5980695371"
		end
		wait()
	end
end)

If anyone could help, that would be very appreciated