Refactoring

Now, we have to find another way to make our code simpler in terms of code and performance. The code shown below.

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main()
        {
            string entry;
            bool keepGoing = true;
            double totalWorkingTime = 0;

            while (keepGoing){
                // Prompt the for minutes exercised
                Console.WriteLine("Enter how many minutes you exercised: ");
                entry = Console.ReadLine(); 

                if (entry.toLower() == "quit")
                {
                    keepGoing = false;
                }
                else
                {
                    try() 
                    {
                        double minutes = int.Parse(entry);

                        if (minutes <= 0)
                        {
                            Console.Write("Not a desired input");
                            continue;
                        }
                        else if (minutes <= 10)
                        {
                            Console.WriteLine("Better than nothing, am I right?");
                        }
                        else if (minutes <= 30)
                        {
                            Console.WriteLine("Press your limit!");
                        }
                        else if (minutes <= 60)
                        {
                            Console.WriteLine("You must be an Indonesia ninja warrior");
                        }
                        else
                        {
                            Console.WriteLine("Okay, now you're just showing off!");
                        }
                    }
                    catch(FormatException)
                    {
                        Console.WriteLine("Not a valid input, try again");
                        continue;
                    }

                    // Add minutes exercised to a running total
                    totalWorkingTime = totalWorkingTime + minutes;

                    // Display the running total in minutes
                    Console.Write("Your total working minutes is " + totalWorkingTime + " minutes");
                }
            }
        }
    }
}

We could improve some code like:

Removing keepGoing variable and turn it into

if (entry.toLower() == "quit")
{
    break;
}

while (true){

}