Lualua

function onStepIn(cid, item, pos)

local sta_min = 1 -- Stamina each minutes

    if not isPlayer(cid) then return true end
    if getPlayerStorageValue(cid, 1451) > -1 then return true end

    for i = 1, 15 do
        addEvent(doPlayerAddStamina, 1*60*1000, cid, sta_min, true)
            setPlayerStorageValue(cid, 1451, -1)
                doPlayerSendTextMessage(cid, 27, "Your stamina train is loading, during 15 minutes!")
            end
                return true
            end

function onStepOut(cid, item, pos)

    if isPlayer(cid) then
        setPlayerStorageValue(cid, 1451, 1)
            doPlayerSendTextMessage(cid, 27, "Your stamina train has been stoped!")
        end
            return true
        end