[Vince]

pawn Код:

stock IsPlayerRunning(playerid)
{
    new
        keys,
        ud,
        lr;

    GetPlayerKeys(playerid, keys, ud, lr);
    
    if(keys & KEY_WALK) 
        return false;

    if(ud == 0 && lr == 0)
        return false;

    return true;
}

Something like that should suffice. Not tested.