Swim Fly Script | ROBLOX

local Flying = false
local Key = "f"
local FlySpeed = 100
local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()

game:GetService("RunService").Stepped:Connect(function()
    if Flying == true then
        Player.Character.Humanoid:ChangeState(4)
        Player.Character.Humanoid.WalkSpeed = FlySpeed
    end
end)

Mouse.KeyDown:Connect(function(Input)
    if Input == string.lower(Key) then
        Flying = not Flying
        Player.Character.Humanoid:ChangeState(4)
        Player.Character.Humanoid.WalkSpeed = game.StarterPlayer.CharacterWalkSpeed
    end
end)