//  Could simply be an extension of Person
class Runner extends Person{
   private String foreName;
   private String familyName;
   private String specialities;
   
   public void setForeName(String foreName){
      this.foreName = foreName;
   }
   
   public String getForeName(){
      return this.foreName;
   }
   
   //  repeat this for familyName and specialities
   
   public String toString(){
      return "Runner - Forename: "+this.foreName+"\tFamily Name: "+this.familyName+"Speciality: "+this.specialities+"\n\n";
   }
}

Runner runner1 = new Runner();
//  Input could be via a database or FileReader
runner.setForeName(Some_Class_That_Takes_In_Strings_On_A_Name_Request);
runner.setFamilName(Inputing_Family_Name);
runner.setSpeciality(some_speciality);
 
//  This is if you are using Java 5
java.util.List<Person> listCompetitors = new ArrayList<Person>();
listCompetitors.add(runner);
//  Iterate through listCompetitors printing each Person
for(Person person: listCompetitors){
   int i = 1;
   System.out.println("Competitor Number "+i+")"+ person.toString());
   i++;
}