diff --git a/public/index.php b/public/index.php
index 4a8c7f1..77dad57 100644
--- a/public/index.php
+++ b/public/index.php
@@ -28,6 +28,10 @@
     require_once('./src/shorturl.php');
   }
   
+  if ($endpoint === 'exercise') {
+    require_once('./src/exercise.php');
+  }
+  
 }
 
 echo 'Invalid API endpoint.';
diff --git a/src/exercise.php b/src/exercise.php
new file mode 100644
index 0000000..1c8af81
--- /dev/null
+++ b/src/exercise.php
@@ -0,0 +1,10 @@
+<?php
+
+// Parse input
+$input = getInput(__FILE__);
+
+// Route request to exercise endpoint in ./src/exercise
+
+
+
+// Helper functions
diff --git a/src/exercise/add.php b/src/exercise/add.php
new file mode 100644
index 0000000..5cd94b4
--- /dev/null
+++ b/src/exercise/add.php
@@ -0,0 +1,2 @@
+<?php
+// add exercise endpoint
\ No newline at end of file
diff --git a/src/exercise/log.php b/src/exercise/log.php
new file mode 100644
index 0000000..7361f51
--- /dev/null
+++ b/src/exercise/log.php
@@ -0,0 +1,2 @@
+<?php
+// exercise log endpoint
\ No newline at end of file
diff --git a/src/exercise/new-user.php b/src/exercise/new-user.php
new file mode 100644
index 0000000..58cbcc8
--- /dev/null
+++ b/src/exercise/new-user.php
@@ -0,0 +1,2 @@
+<?php
+// new-user endpoint
\ No newline at end of file
diff --git a/src/exercise/users.php b/src/exercise/users.php
new file mode 100644
index 0000000..f0628da
--- /dev/null
+++ b/src/exercise/users.php
@@ -0,0 +1,2 @@
+<?php
+// get all users endpoint
\ No newline at end of file