===================================================================
--- original.js
+++ change.js
@@ -120,9 +120,9 @@
 		self.leftLeg.y += (self.targetPosture.leftLeg.y - self.leftLeg.y) * speed;
 		self.leftLeg.rotation += (self.targetPosture.leftLeg.r - self.leftLeg.rotation) * speed;
 		self.leftLeg.height += (self.targetPosture.leftLeg.h - self.leftLeg.height) * speed;
 	};
-	self.update = function () {
+	self._update_migrated = function () {
 		/* ********************************************************** AI ATHLETE **************************************************** */
 		if (self.isAi) {
 			// AI Athlete
 			var nextX = self.x;
@@ -370,9 +370,9 @@
 		self.isRunning = true;
 	};
 	self.stop = function () {
 		log("stop...");
-		self.x = self.previousX || 400 + 100 * self.lineIndex;
+		self.x = self.previousX || startX + 100 * self.lineIndex;
 		self.y = linesGroundLevels[self.lineIndex];
 		self.speedY = 0;
 		self.trunk.rotation = 0;
 		self.rightArm.rotation = idlePosture.rightArm.r;
@@ -422,9 +422,9 @@
 		x: 580,
 		y: -1540
 	});
 	self.speedX = globalSpeedPerLine[0];
-	self.update = function () {
+	self._update_migrated = function () {
 		self.speedX = globalSpeedPerLine[0];
 		self.x += self.speedX;
 	};
 	self.cut = function () {
@@ -467,9 +467,9 @@
 		x: 95,
 		y: -460
 	});
 	self.speedX = globalSpeedPerLine[0];
-	self.update = function () {
+	self._update_migrated = function () {
 		self.speedX = globalSpeedPerLine[0];
 		self.x += self.speedX;
 	};
 });
@@ -517,9 +517,9 @@
 		anchorX: 0.0,
 		anchorY: 0.0
 	});
 	// Method to update track position
-	self.update = function () {
+	self._update_migrated = function () {
 		self.speedX = globalSpeedPerLine[0];
 		self.x += self.speedX;
 		// Reset position to create a continuous track effect
 		if (self.x <= -2048 - self.speedX * 2) {
@@ -563,8 +563,9 @@
 var obstacleSpawnTicker = 0;
 var obstacleSpawnDistanceRate = 1.5; // Ratio of screen width between obstacles
 var obstacleJustPassed = false;
 var startingBlocks = [];
+var startX = 600;
 var aiJumpLeftLimit = -350;
 var aiJumpRightLimit = 2048 + 512;
 var finishLine;
 var stadium;
@@ -829,22 +830,22 @@
 	// Update Progress
 	updateProgress();
 	// Update opponents
 	for (var i = numberOfOpponents - 1; i >= 0; i--) {
-		opponents[i].update();
+		opponents[i]._update_migrated();
 		game.addChild(opponents[i]);
 	}
 	// Update athlete
-	athlete.update();
+	athlete._update_migrated();
 	game.addChild(athlete);
 	// Check for collisions
 	checkForCollisions();
 }
 function hurdlesStarting() {
 	log("hurdlesStarting...");
 	for (var i = 0; i <= numberOfOpponents; i++) {
 		var athletes = [athlete].concat(opponents);
-		athletes[i].update();
+		athletes[i]._update_migrated();
 	}
 }
 function cleanMenuState() {
 	game.removeChild(startText);
@@ -855,9 +856,9 @@
 	// Spawn obstacles
 	spawnObstacles();
 	// Add starting blocks to each athlete's starting position
 	for (var i = 0; i <= numberOfOpponents; i++) {
-		startingBlocks[i] = new StartingBlocks(400 + 100 * i, linesGroundLevels[i]);
+		startingBlocks[i] = new StartingBlocks(startX + 100 * i, linesGroundLevels[i]);
 		game.addChild(startingBlocks[i]);
 	}
 	// Initialize opponents
 	for (var i = numberOfOpponents - 1; i >= 0; i--) {
@@ -926,12 +927,12 @@
 	}
 }
 function updateTracks() {
 	if (!(athlete.isFalling && athlete.isOnGround)) {
-		track.update();
-		track2.update();
-		track3.update();
-		track4.update();
+		track._update_migrated();
+		track2._update_migrated();
+		track3._update_migrated();
+		track4._update_migrated();
 	}
 }
 function spawnObstacles() {
 	// Set obstacles for line 0
@@ -967,9 +968,9 @@
 	// Update obstacles
 	for (var line = 0; line < numberOfLines; line++) {
 		obstacles[line] = obstacles[line] || [];
 		for (var i = obstacles[line].length - 1; i >= 0; i--) {
-			obstacles[line][i].update();
+			obstacles[line][i]._update_migrated();
 			// Remove obstacle if it moves off-screen and increase global speed
 			if (obstacles[line][i].x < -100) {
 				// Assuming obstacle width is less than 100px
 				obstacles[line][i].destroy();
@@ -979,9 +980,9 @@
 				}
 			}
 		}
 	}
-	finishLine.update();
+	finishLine._update_migrated();
 }
 function updateProgress() {
 	if (obstacleJustPassed && !finishLine.isCut) {
 		// Update Progress