Block that slows you down?

The Script

local part = game.Workspace.Part -- this identifies the part that will be touched
local walkspeed = 10 -- this is the walkspeed that the humanoid will be set too when comming in contact with the part
local oldwalkspeed = 0 -- Don't change this (this saves your walkspeed that you had before touching the part, so that we can give it back to you later.
local debounce = false -- debounces are used to make the code run only when in an idle state (idle as in not being ran)
local debounce2 = false

part.Touched:Connect(function(hit) -- fires the function when the part is touched. (hit) defines the player that touched it.
	if hit.Parent:FindFirstChild("Humanoid") and hit.Parent.Humanoid.Health > 0 and hit.Parent.Humanoid.WalkSpeed ~= walkspeed then -- this checks if whatever touched it has a humanoid (all players have a humanoid) and if the player is not dead (has more then 0 health) as well as checking if the player already has there speed affected
		if debounce == false then -- checks if the debounce is false
			debounce = true -- makes the debounce true so that when the if statement above checks if it is false it won't be so the code will not fire again.
			oldwalkspeed = hit.Parent.Humanoid.WalkSpeed -- this changes oldwalkspeed to the walkspeed you had before touching the part
			hit.Parent.Humanoid.WalkSpeed = walkspeed -- this sets the player who touched the parts walkspeed to the same value as walkspeed.
			wait(1) -- waits 1 second before continuing the script
			debounce = false -- set's the debounce to false so that the function above can be ran again
		end -- ends the debounce if/then statement
	end -- ends the player check and health check if/then statement
end) -- ends the .Touched function

part.TouchEnded:Connect(function(hit) -- fires when the part stops being touched.
	if hit.Parent:FindFirstChild("Humanoid") and hit.Parent.Humanoid.Health > 0 then
		if debounce2 == false then
			debounce2 = true
			wait(5) -- waits 5 seconds before continuing reading the code
			hit.Parent.Humanoid.WalkSpeed = oldwalkspeed -- sets the players walkspeed to the same walkspeed they had before touching the part.
			wait(1)
			debounce2 = false
		end
	end
end)

Study this code. I left you notes for a reason.