diff --git a/src/play_clj/core_graphics.clj b/src/play_clj/core_graphics.clj
index 5b5827c..7f33345 100644
--- a/src/play_clj/core_graphics.clj
+++ b/src/play_clj/core_graphics.clj
@@ -234,7 +234,13 @@
       (.step ^World world time-step velocity-iterations position-iterations)))
   ([screen entities]
     (step! screen)
-    entities))
+    (map (fn [entity]
+           (if-let [body (:body entity)]
+             (assoc entity
+                    :x (g2dp/body-x body)
+                    :y (g2dp/body-y body))
+             entity))
+         entities)))
 
 ; cameras
 
diff --git a/src/play_clj/g2d_physics.clj b/src/play_clj/g2d_physics.clj
index 204ac09..0524762 100644
--- a/src/play_clj/g2d_physics.clj
+++ b/src/play_clj/g2d_physics.clj
@@ -2,7 +2,7 @@
   (:require [play-clj.math :as m]
             [play-clj.utils :as u])
   (:import [com.badlogic.gdx.physics.box2d Body BodyDef ChainShape CircleShape
-            ContactListener EdgeShape FixtureDef PolygonShape World]))
+            ContactListener EdgeShape FixtureDef PolygonShape Transform World]))
 
 ; world
 
@@ -54,6 +54,34 @@
      (u/calls! ^Body object# ~@options)
      object#))
 
+(defn body-x
+  [entity]
+  (. (body! entity :get-position) x))
+
+(defn body-y
+  [entity]
+  (. (body! entity :get-position) y))
+
+(defn body-angle
+  [entity]
+  (.getRotation ^Transform (body! entity :get-transform)))
+
+(defn body-transform!
+  [entity x y angle]
+  (body! entity :set-transform x y angle))
+
+(defn body-x!
+  [entity x]
+  (body-transform! entity x (body-y entity) (body-angle entity)))
+
+(defn body-y!
+  [entity y]
+  (body-transform! entity (body-x entity) y (body-angle entity)))
+
+(defn body-angle!
+  [entity angle]
+  (body-transform! entity (body-x entity) (body-y entity) angle))
+
 ; fixtures
 
 (defn fixture