diff --git a/src/body/Body.js b/src/body/Body.js
index ac4dd75b..1166c0bc 100644
--- a/src/body/Body.js
+++ b/src/body/Body.js
@@ -404,68 +404,6 @@ var Body = {};
         Bounds.update(body.bounds, body.vertices, body.velocity);
     };
 
-    /**
-     * Zeroes the `body.force` and `body.torque` force buffers.
-     * @method resetForcesAll
-     * @param {body[]} bodies
-     */
-    Body.resetForcesAll = function(bodies) {
-        for (var i = 0; i < bodies.length; i++) {
-            var body = bodies[i];
-
-            // reset force buffers
-            body.force.x = 0;
-            body.force.y = 0;
-            body.torque = 0;
-        }
-    };
-
-    /**
-     * Applys a mass dependant force to all given bodies.
-     * @method applyGravityAll
-     * @param {body[]} bodies
-     * @param {vector} gravity
-     */
-    Body.applyGravityAll = function(bodies, gravity) {
-        for (var i = 0; i < bodies.length; i++) {
-            var body = bodies[i];
-
-            if (body.isStatic || body.isSleeping)
-                continue;
-
-            // apply gravity
-            body.force.y += body.mass * gravity.y * 0.001;
-            body.force.x += body.mass * gravity.x * 0.001;
-        }
-    };
-
-    /**
-     * Applys `Body.update` to all given `bodies`.
-     * @method updateAll
-     * @param {body[]} bodies
-     * @param {number} deltaTime 
-     * The amount of time elapsed between updates
-     * @param {number} timeScale
-     * @param {number} correction 
-     * The Verlet correction factor (deltaTime / lastDeltaTime)
-     * @param {bounds} worldBounds
-     */
-    Body.updateAll = function(bodies, deltaTime, timeScale, correction, worldBounds) {
-        for (var i = 0; i < bodies.length; i++) {
-            var body = bodies[i];
-
-            if (body.isStatic || body.isSleeping)
-                continue;
-
-            // don't update out of world bodies
-            if (body.bounds.max.x < worldBounds.min.x || body.bounds.min.x > worldBounds.max.x
-                || body.bounds.max.y < worldBounds.min.y || body.bounds.min.y > worldBounds.max.y)
-                continue;
-
-            Body.update(body, deltaTime, timeScale, correction);
-        }
-    };
-
     /**
      * Performs a simulation step for the given `body`, including updating position and angle using Verlet integration.
      * @method update
diff --git a/src/core/Engine.js b/src/core/Engine.js
index 660d68fd..4a4664ed 100644
--- a/src/core/Engine.js
+++ b/src/core/Engine.js
@@ -110,10 +110,10 @@ var Engine = {};
             Sleeping.update(allBodies, timing.timeScale);
 
         // applies gravity to all bodies
-        Body.applyGravityAll(allBodies, world.gravity);
+        _bodiesApplyGravity(allBodies, world.gravity);
 
         // update all body position and rotation by integration
-        Body.updateAll(allBodies, delta, timing.timeScale, correction, world.bounds);
+        _bodiesUpdate(allBodies, delta, timing.timeScale, correction, world.bounds);
 
         // update all constraints
         for (i = 0; i < engine.constraintIterations; i++) {
@@ -177,7 +177,7 @@ var Engine = {};
         Metrics.update(engine.metrics, engine);
 
         // clear force buffers
-        Body.resetForcesAll(allBodies);
+        _bodiesClearForces(allBodies);
 
         // clear all composite modified flags
         if (world.isModified)
@@ -247,6 +247,71 @@ var Engine = {};
         }
     };
 
+    /**
+     * Zeroes the `body.force` and `body.torque` force buffers.
+     * @method bodiesClearForces
+     * @private
+     * @param {body[]} bodies
+     */
+    var _bodiesClearForces = function(bodies) {
+        for (var i = 0; i < bodies.length; i++) {
+            var body = bodies[i];
+
+            // reset force buffers
+            body.force.x = 0;
+            body.force.y = 0;
+            body.torque = 0;
+        }
+    };
+
+    /**
+     * Applys a mass dependant force to all given bodies.
+     * @method bodiesApplyGravity
+     * @private
+     * @param {body[]} bodies
+     * @param {vector} gravity
+     */
+    var _bodiesApplyGravity = function(bodies, gravity) {
+        for (var i = 0; i < bodies.length; i++) {
+            var body = bodies[i];
+
+            if (body.isStatic || body.isSleeping)
+                continue;
+
+            // apply gravity
+            body.force.y += body.mass * gravity.y * 0.001;
+            body.force.x += body.mass * gravity.x * 0.001;
+        }
+    };
+
+    /**
+     * Applys `Body.update` to all given `bodies`.
+     * @method updateAll
+     * @private
+     * @param {body[]} bodies
+     * @param {number} deltaTime 
+     * The amount of time elapsed between updates
+     * @param {number} timeScale
+     * @param {number} correction 
+     * The Verlet correction factor (deltaTime / lastDeltaTime)
+     * @param {bounds} worldBounds
+     */
+    var _bodiesUpdate = function(bodies, deltaTime, timeScale, correction, worldBounds) {
+        for (var i = 0; i < bodies.length; i++) {
+            var body = bodies[i];
+
+            if (body.isStatic || body.isSleeping)
+                continue;
+
+            // don't update out of world bodies
+            if (body.bounds.max.x < worldBounds.min.x || body.bounds.min.x > worldBounds.max.x
+                || body.bounds.max.y < worldBounds.min.y || body.bounds.min.y > worldBounds.max.y)
+                continue;
+
+            Body.update(body, deltaTime, timeScale, correction);
+        }
+    };
+
     /**
      * An alias for `Runner.run`, see `Matter.Runner` for more information.
      * @method run