local plr = game.Players.LocalPlayer
local fly = false
local speed = 40

game:GetService("UserInputService").InputBegan:Connect(function(input)
    if input.KeyCode == Enum.KeyCode.F then
        fly = not fly
        if fly then
            plr.Character.Humanoid.PlatformStand = true
            local bv = Instance.new("BodyVelocity")
            bv.Parent = plr.Character.HumanoidRootPart
            bv.MaxForce = Vector3.new(9e9,9e9,9e9)
            while fly do
                bv.Velocity = plr.Character.Humanoid.MoveDirection * speed
                wait()
            end
            bv:Destroy()
            plr.Character.Humanoid.PlatformStand = false
        end
    end
end)