diff --git a/src/EasyGA.py b/src/EasyGA.py
index ebc7bde..d3c620d 100644
--- a/src/EasyGA.py
+++ b/src/EasyGA.py
@@ -110,7 +110,7 @@ class GA(Attributes):
         for chromosome in self.population.get_chromosome_list():
 
             # Update fitness if needed or asked by the user
-            if chromosome.get_fitness() is None or self.update_fitness:
+            if chromosome.fitness is None or self.update_fitness:
                 chromosome.set_fitness(self.fitness_function_impl(chromosome))
 
 
@@ -122,10 +122,10 @@ class GA(Attributes):
         """
 
         return sorted(
-                chromosome_list,                                    # list to be sorted
-                key = lambda chromosome: chromosome.get_fitness(),  # by fitness
-                reverse = (self.target_fitness_type == 'max')       # ordered by fitness type
-            )
+                   chromosome_list,                               # list to be sorted
+                   key = lambda chromosome: chromosome.fitness,   # by fitness
+                   reverse = (self.target_fitness_type == 'max')  # ordered by fitness type
+               )
 
 
     def get_chromosome_fitness(self, index):
@@ -169,13 +169,13 @@ class GA(Attributes):
         print(self.population)
 
 
-    def print_best(self):
+    def print_best_chromosome(self):
         """Prints the best chromosome and its fitness"""
         print(f"Best Chromosome \t: {self.population[0]}")
         print(f"Best Fitness    \t: {self.population[0].get_fitness()}")
 
 
-    def print_worst(self):
+    def print_worst_chromosome(self):
         """Prints the worst chromosome and its fitness"""
         print(f"Worst Chromosome \t: {self.population[-1]}")
         print(f"Worst Fitness    \t: {self.population[-1].get_fitness()}")