diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index 0f97fe4..529b78d 100644
--- a/src/main/java/com/booleanuk/core/Exercise.java
+++ b/src/main/java/com/booleanuk/core/Exercise.java
@@ -11,33 +11,51 @@ public class Exercise {
 
     public void stepOne() {
         // TODO: 1. Write a for loop that adds the numbers 0 to 3 to the numsZeroToThree array
-
+        numsZeroToThree = new int[4];
+        for (int i = 0; i <= 3; i++) {
+            numsZeroToThree[i] += i;
+        }
 
     }
 
     public void stepTwo() {
         // TODO: 2. Write a for loop that adds the numbers 5 to 10 to the numsFiveToTen array
+        numsFiveToTen = new int[6];
 
+        for (int i = 0; i <= 5; i++) {
+            numsFiveToTen[i] = i+5;
+        }
 
     }
 
     public void stepThree() {
         // TODO: 3. Write a for loop that adds the numbers 3 to 0 (in that order) to the countdown array
+        countdown = new int[4];
 
+        int start = 3;
+        for (int i = 0; i < 4; i++) {
+            countdown[i] = start - i;
+        }
 
     }
 
     public boolean stepFour(int num) {
         // TODO: 6. Write a for loop that checks if num is in the favouriteNumbers array
-
-
-
+        for (int number : favouriteNumbers) {
+            if (num == number) {
+                return true;
+            }
+        }
         return false;
     }
 
     public boolean stepFive(String hobby) {
         // TODO 5. Write a for loop that checks if the hobby String is in the myHobbies array
-
+        for (String txt : myHobbies) {
+            if (txt.equals(hobby)) {
+                return true;
+            }
+        }
 
 
         return false;
diff --git a/src/main/java/com/booleanuk/extension/Extension.java b/src/main/java/com/booleanuk/extension/Extension.java
index 8b9d4a6..4cf0bd7 100644
--- a/src/main/java/com/booleanuk/extension/Extension.java
+++ b/src/main/java/com/booleanuk/extension/Extension.java
@@ -5,7 +5,13 @@ public class Extension {
 
     public void stepOne() {
         // TODO: 1. Write a for loop that adds all the even numbers between 0 and 6 (0, 2, 4, 6) to evenNums
+        numsEven = new int[4];
 
+        for (int i = 0; i <= 6; i++) {
+            if ((i % 2) == 0) {
+                numsEven[i/2] = i;
+            }
+        }
 
         
     }