public Individual getFittest() {
        //Individual fittest = individuals[0];
        // Loop through individuals to find fittest
        /*for (int i = 0; i < size(); i++) {
            if (fittest.getFitness() <= getIndividual(i).getFitness()) {
                fittest = getIndividual(i);
            }
        }*/
        ExecutorService es = Executors.newCachedThreadPool();
        for(int i=0;i<5;i++)
            es.execute(new Runnable() {
                /*  your task */
                Individual fittest = individuals[0];
                @Override
                public void run() {
                    // A TUKAJ CEL FOR KLICEM NORMALNO?
                    for (int i = 0; i < size(); i++) {
                        if (fittest.getFitness() <= getIndividual(i).getFitness()) {
                            fittest = getIndividual(i);
                        }
                    }
                }
            });
        es.shutdown();
        try {
            boolean finshed = es.awaitTermination(3000, TimeUnit.MILLISECONDS);
            // all tasks have finished or the time has been reached.
        } catch (InterruptedException e){
            System.out.println("Thread interrupted!");
        }

        // KAKO VRNEM OD ABSTRACT CLASSA
        return ???;
    }