very simple inf stamina

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local Players = game:GetService("Players")
local LocalPlayer = Players.LocalPlayer

local playerData = LocalPlayer:WaitForChild("PlayerData", 5)

if playerData then
    local stamina = playerData:FindFirstChild("Stamina")
    local maxStamina = playerData:FindFirstChild("MaxStamina")

    if stamina then
        stamina.Value = 99999999
    end

    if maxStamina then
        maxStamina.Value = 99999999
    end
end