Code is not validating the <=0 if statemenet

using System;

namespace Fitness.AP
{
class Program
  {
      static void Main()
      {  
        int runningTotal = 0;

          bool keepGoing = true;

      while(keepGoing)  {
        // Prompt user for minutes exercised 
           Console.Write("Enter how many minutes you exercised or type \"quit\" to exit:" +" ");
        // gathering input from user
          string workoutmin = System.Console.ReadLine(); 
           if(workoutmin == "quit")
                {
                    keepGoing = false;
                }
                else
                {
       int minutes = int.Parse(workoutmin);

             if(minutes <= 0)
                    {
                        Console.WriteLine(minutes + " is not an acceptable value.");
                        continue;
                    }
                    else if(minutes <= 10)
                    {
                        Console.WriteLine("Better than nothing, am I right?");
                    }
                    else if(minutes <= 30)
                    {
                        Console.WriteLine("Way to go hot stuff!");
                    }
                    else if(minutes <= 60)
                    {
                        Console.WriteLine("You must be a ninja warrior in training!");
                    }
                    else
                    {        
                        Console.WriteLine("Okay, now you're just showing off!");
                    }



        runningTotal= runningTotal + minutes;
        //writing  user input back to them
     Console.Write("You have entered:" + " " + runningTotal +   " "  + "Minutes"  + "\r\n " ); 

        }

      }
      Console.WriteLine("Bye");
      }
}
}