R15 Flying ablity script

local plr = game:GetService("Players").LocalPlayer
local char = plr.Character
local uis = game:GetService("UserInputService")


uis.InputBegan:connect(function(key)
    if key.KeyCode == Enum.KeyCode.F then
        if not char.UpperTorso:FindFirstChild("BodyForce") then
            local b = Instance.new("BodyForce", char.UpperTorso)
            b.Force = Vector3.new(0,4990,0)
        end
    end
end)