diff --git a/examples/material_gallery/flutter.yaml b/examples/material_gallery/flutter.yaml
index 1b0ab27013..4452dbd1ad 100644
--- a/examples/material_gallery/flutter.yaml
+++ b/examples/material_gallery/flutter.yaml
@@ -20,7 +20,10 @@ assets:
   - packages/flutter_gallery_assets/icon-snow.png
   - packages/flutter_gallery_assets/kangaroo_valley_safari.png
   - packages/flutter_gallery_assets/top_10_australian_beaches.png
+  - packages/flutter_gallery_assets/jumpingjack.json
+  - packages/flutter_gallery_assets/jumpingjack.png
 material-design-icons:
+  - name: action/accessibility
   - name: action/account_circle
   - name: action/alarm
   - name: action/android
@@ -29,6 +32,8 @@ material-design-icons:
   - name: action/home
   - name: action/hourglass_empty
   - name: action/language
+  - name: av/play_arrow
+  - name: av/stop
   - name: communication/call
   - name: communication/email
   - name: communication/location_on
@@ -39,6 +44,8 @@ material-design-icons:
   - name: content/create
   - name: image/brightness_5
   - name: image/brightness_7
+  - name: image/flash_on
+  - name: image/timer
   - name: navigation/arrow_back
   - name: navigation/arrow_drop_down
   - name: navigation/arrow_forward
diff --git a/examples/material_gallery/lib/demo/fitness_demo.dart b/examples/material_gallery/lib/demo/fitness_demo.dart
new file mode 100644
index 0000000000..e2e12ecfea
--- /dev/null
+++ b/examples/material_gallery/lib/demo/fitness_demo.dart
@@ -0,0 +1,491 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+import 'dart:math' as math;
+import 'dart:ui' as ui;
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_sprites/flutter_sprites.dart';
+
+ImageMap _images;
+SpriteSheet _sprites;
+
+class FitnessDemo extends StatelessComponent {
+  FitnessDemo({ Key key }) : super(key: key);
+
+  Widget build(BuildContext context) {
+    return new Scaffold(
+      toolBar: new ToolBar(
+        center: new Text("Fitness")
+      ),
+      body: new _FitnessDemoContents()
+    );
+  }
+}
+
+class _FitnessDemoContents extends StatefulComponent {
+  _FitnessDemoContents({ Key key }) : super(key: key);
+  _FitnessDemoContentsState createState() => new _FitnessDemoContentsState();
+}
+
+class _FitnessDemoContentsState extends State<_FitnessDemoContents> {
+
+  Future _loadAssets(AssetBundle bundle) async {
+    _images = new ImageMap(bundle);
+    await _images.load(<String>[
+      'packages/flutter_gallery_assets/jumpingjack.png',
+    ]);
+
+    String json = await DefaultAssetBundle.of(context).loadString('packages/flutter_gallery_assets/jumpingjack.json');
+    _sprites = new SpriteSheet(_images['packages/flutter_gallery_assets/jumpingjack.png'], json);
+  }
+
+  void initState() {
+    super.initState();
+
+    AssetBundle bundle = DefaultAssetBundle.of(context);
+    _loadAssets(bundle).then((_) {
+      setState(() {
+        assetsLoaded = true;
+        workoutAnimation = new _WorkoutAnimationNode(
+          onPerformedJumpingJack: () {
+            setState(() {
+              count += 1;
+            });
+          },
+          onSecondPassed: (int seconds) {
+            setState(() {
+              time = seconds;
+            });
+          }
+        );
+      });
+    });
+  }
+
+  bool assetsLoaded = false;
+  int count = 0;
+  int time = 0;
+  int get kcal => (count * 0.2).toInt();
+
+  _WorkoutAnimationNode workoutAnimation;
+
+  Widget build(BuildContext context) {
+    if (!assetsLoaded)
+      return new Container();
+
+    Color buttonColor;
+    String buttonText;
+    VoidCallback onButtonPressed;
+
+    if (workoutAnimation.workingOut) {
+      buttonColor = Colors.red[500];
+      buttonText = "STOP WORKOUT";
+      onButtonPressed = endWorkout;
+    } else {
+      buttonColor = Theme.of(context).primaryColor;
+      buttonText = "START WORKOUT";
+      onButtonPressed = startWorkout;
+    }
+
+    return new Material(
+      child: new Column(
+        justifyContent: FlexJustifyContent.center,
+        children: <Widget>[
+          new Flexible(
+            child: new Container(
+              decoration: new BoxDecoration(backgroundColor: Colors.grey[800]),
+              child: new SpriteWidget(workoutAnimation, SpriteBoxTransformMode.scaleToFit)
+            )
+          ),
+          new Padding(
+            padding: new EdgeDims.only(top: 20.0),
+            child: new Text("JUMPING JACKS", style: Theme.of(context).text.title)
+          ),
+          new Padding(
+            padding: new EdgeDims.only(top: 20.0, bottom: 20.0),
+            child: new Row(
+              justifyContent: FlexJustifyContent.center,
+              children: <Widget>[
+                _createInfoPanelCell("action/accessibility", "$count", "COUNT"),
+                _createInfoPanelCell("image/timer", _formatSeconds(time), "TIME"),
+                _createInfoPanelCell("image/flash_on", "$kcal", "KCAL")
+              ]
+            )
+          ),
+          new Padding(
+            padding: new EdgeDims.only(bottom: 16.0),
+            child: new SizedBox(
+              width: 300.0,
+              height: 72.0,
+              child: new RaisedButton (
+                onPressed: onButtonPressed,
+                color: buttonColor,
+                child: new Text(
+                  buttonText,
+                  style: new TextStyle(color: Colors.white, fontSize: 20.0)
+                )
+              )
+            )
+          )
+        ]
+      )
+    );
+  }
+
+  Widget _createInfoPanelCell(String icon, String value, String description) {
+    Color color;
+    if (workoutAnimation.workingOut)
+      color = Colors.black87;
+    else
+      color = Theme.of(context).disabledColor;
+
+    return new Container(
+      width: 100.0,
+      child: new Center(
+        child: new Column(
+          children: <Widget>[
+            new Icon(icon: icon, size: IconSize.s48, color: color),
+            new Text(value, style: new TextStyle(fontSize: 24.0, color: color)),
+            new Text(description, style: new TextStyle(color: color))
+          ]
+        )
+      )
+    );
+  }
+
+  String _formatSeconds(int seconds) {
+    int minutes = seconds ~/ 60;
+    String secondsStr = "${seconds % 60}".padLeft(2, "0");
+    return "$minutes:$secondsStr";
+  }
+
+  void startWorkout() {
+    setState(() {
+      count = 0;
+      time = 0;
+      workoutAnimation.start();
+    });
+  }
+
+  void endWorkout() {
+    setState(() {
+      workoutAnimation.stop();
+    });
+  }
+}
+
+typedef void _SecondPassedCallback(int seconds);
+
+class _WorkoutAnimationNode extends NodeWithSize {
+  _WorkoutAnimationNode({
+    this.onPerformedJumpingJack,
+    this.onSecondPassed
+  }) : super(const Size(1024.0, 1024.0)) {
+    reset();
+
+    _progress = new _ProgressCircle(const Size(800.0, 800.0));
+    _progress.pivot = const Point(0.5, 0.5);
+    _progress.position = const Point(512.0, 512.0);
+    addChild(_progress);
+
+    _jumpingJack = new _JumpingJack((){
+      onPerformedJumpingJack();
+    });
+    _jumpingJack.scale = 0.5;
+    _jumpingJack.position = const Point(512.0, 550.0);
+    addChild(_jumpingJack);
+  }
+
+  final VoidCallback onPerformedJumpingJack;
+  final _SecondPassedCallback onSecondPassed;
+
+  int seconds;
+
+  bool workingOut;
+
+  static const int _kTargetMillis = 1000 * 30;
+  int _startTimeMillis;
+  _ProgressCircle _progress;
+  _JumpingJack _jumpingJack;
+
+  void reset() {
+    seconds = 0;
+    workingOut = false;
+  }
+
+  void start() {
+    reset();
+    _startTimeMillis = new DateTime.now().millisecondsSinceEpoch;
+    workingOut = true;
+    _jumpingJack.animateJumping();
+  }
+
+  void stop() {
+    workingOut = false;
+    _jumpingJack.neutralPose();
+  }
+
+  void update(double dt) {
+    if (workingOut) {
+      int millis = new DateTime.now().millisecondsSinceEpoch - _startTimeMillis;
+      int newSeconds = (millis) ~/ 1000;
+      if (newSeconds != seconds) {
+        seconds = newSeconds;
+        onSecondPassed(seconds);
+      }
+
+      _progress.value = millis / _kTargetMillis;
+    } else {
+      _progress.value = 0.0;
+    }
+  }
+}
+
+class _ProgressCircle extends NodeWithSize {
+  _ProgressCircle(Size size, [this.value = 0.0]) : super(size);
+
+  static const _kTwoPI = math.PI * 2.0;
+  static const _kEpsilon = .0000001;
+  static const _kSweep = _kTwoPI - _kEpsilon;
+
+  double value;
+
+  void paint(Canvas canvas) {
+    applyTransformForPivot(canvas);
+
+    Paint circlePaint = new Paint()
+      ..color = Colors.white30
+      ..strokeWidth = 24.0
+      ..style = ui.PaintingStyle.stroke;
+
+    canvas.drawCircle(
+      new Point(size.width / 2.0, size.height / 2.0),
+      size.width / 2.0,
+      circlePaint
+    );
+
+    Paint pathPaint = new Paint()
+      ..color = Colors.purple[500]
+      ..strokeWidth = 25.0
+      ..style = ui.PaintingStyle.stroke;
+
+    double angle = value.clamp(0.0, 1.0) * _kSweep;
+    Path path = new Path()
+      ..arcTo(Point.origin & size, -math.PI / 2.0, angle, false);
+    canvas.drawPath(path, pathPaint);
+  }
+}
+
+class _JumpingJack extends Node {
+  _JumpingJack(VoidCallback onPerformedJumpingJack) {
+    left = new _JumpingJackSide(false, onPerformedJumpingJack);
+    right = new _JumpingJackSide(true, null);
+    addChild(left);
+    addChild(right);
+  }
+
+  void animateJumping() {
+    left.animateJumping();
+    right.animateJumping();
+  }
+
+  void neutralPose() {
+    left.neutralPosition(true);
+    right.neutralPosition(true);
+  }
+
+  _JumpingJackSide left;
+  _JumpingJackSide right;
+}
+
+class _JumpingJackSide extends Node {
+  _JumpingJackSide(bool right, this.onPerformedJumpingJack) {
+    // Torso and head
+    torso = _createPart('torso.png', const Point(512.0, 512.0));
+    addChild(torso);
+
+    head = _createPart('head.png', const Point(512.0, 160.0));
+    torso.addChild(head);
+
+    if (right) {
+      torso.opacity = 0.0;
+      head.opacity = 0.0;
+      torso.scaleX = -1.0;
+    }
+
+    // Left side movable parts
+    upperArm = _createPart('upper-arm.png', const Point(445.0, 220.0));
+    torso.addChild(upperArm);
+    lowerArm = _createPart('lower-arm.png', const Point(306.0, 200.0));
+    upperArm.addChild(lowerArm);
+    hand = _createPart('hand.png', const Point(215.0, 127.0));
+    lowerArm.addChild(hand);
+    upperLeg = _createPart('upper-leg.png', const Point(467.0, 492.0));
+    torso.addChild(upperLeg);
+    lowerLeg = _createPart('lower-leg.png', const Point(404.0, 660.0));
+    upperLeg.addChild(lowerLeg);
+    foot = _createPart('foot.png', const Point(380.0, 835.0));
+    lowerLeg.addChild(foot);
+
+    torso.setPivotAndPosition(Point.origin);
+
+    neutralPosition(false);
+  }
+
+  _JumpingJackPart torso;
+  _JumpingJackPart head;
+  _JumpingJackPart upperArm;
+  _JumpingJackPart lowerArm;
+  _JumpingJackPart hand;
+  _JumpingJackPart lowerLeg;
+  _JumpingJackPart upperLeg;
+  _JumpingJackPart foot;
+
+  final VoidCallback onPerformedJumpingJack;
+
+  _JumpingJackPart _createPart(String textureName, Point pivotPosition) {
+    return new _JumpingJackPart(_sprites[textureName], pivotPosition);
+  }
+
+  void animateJumping() {
+    actions.stopAll();
+    actions.run(new ActionSequence([
+      _createPoseAction(null, 0, 0.5),
+      new ActionCallFunction(_animateJumpingLoop)
+    ]));
+  }
+
+  void _animateJumpingLoop() {
+    actions.run(new ActionRepeatForever(
+      new ActionSequence(<Action>[
+        _createPoseAction(0, 1, 0.30),
+        _createPoseAction(1, 2, 0.30),
+        _createPoseAction(2, 1, 0.30),
+        _createPoseAction(1, 0, 0.30),
+        new ActionCallFunction(() {
+          if (onPerformedJumpingJack != null)
+            onPerformedJumpingJack();
+        })
+      ])
+    ));
+  }
+
+  void neutralPosition(bool animate) {
+    actions.stopAll();
+    if (animate) {
+      actions.run(_createPoseAction(null, 1, 0.5));
+    } else {
+      List<double> d = _dataForPose(1);
+      upperArm.rotation = d[0];
+      lowerArm.rotation = d[1];
+      hand.rotation = d[2];
+      upperLeg.rotation = d[3];
+      lowerLeg.rotation = d[4];
+      foot.rotation = d[5];
+      torso.position = new Point(0.0, d[6]);
+    }
+  }
+
+  ActionInterval _createPoseAction(int startPose, int endPose, double duration) {
+    List<double> d0 = _dataForPose(startPose);
+    List<double> d1 = _dataForPose(endPose);
+
+    List<ActionTween> tweens = <ActionTween>[
+      _tweenRotation(upperArm, d0[0], d1[0], duration),
+      _tweenRotation(lowerArm, d0[1], d1[1], duration),
+      _tweenRotation(hand, d0[2], d1[2], duration),
+      _tweenRotation(upperLeg, d0[3], d1[3], duration),
+      _tweenRotation(lowerLeg, d0[4], d1[4], duration),
+      _tweenRotation(foot, d0[5], d1[5], duration),
+      new ActionTween(
+        (Point a) => torso.position = a,
+        new Point(0.0, d0[6]),
+        new Point(0.0, d1[6]),
+        duration
+      )
+    ];
+
+    return new ActionGroup(tweens);
+  }
+
+  ActionTween _tweenRotation(_JumpingJackPart part, double r0, double r1, double duration) {
+    return new ActionTween(
+      (double a) => part.rotation = a,
+      r0,
+      r1,
+      duration
+    );
+  }
+
+  List<double> _dataForPose(int pose) {
+    if (pose == null)
+      return _dataForCurrentPose();
+
+    if (pose == 0) {
+      return <double>[
+        -80.0, // Upper arm rotation
+        -30.0, // Lower arm rotation
+        -10.0, // Hand rotation
+        -15.0, // Upper leg rotation
+        5.0,   // Lower leg rotation
+        15.0,  // Foot rotation
+        0.0    // Torso y offset
+      ];
+    } else if (pose == 1) {
+      return <double>[
+        0.0,
+        0.0,
+        0.0,
+        0.0,
+        0.0,
+        0.0,
+        -70.0
+      ];
+    } else {
+      return <double>[
+        40.0,
+        30.0,
+        10.0,
+        20.0,
+        -20.0,
+        15.0,
+        40.0
+      ];
+    }
+  }
+
+  List<double> _dataForCurrentPose() {
+    return <double>[
+      upperArm.rotation,
+      lowerArm.rotation,
+      hand.rotation,
+      upperLeg.rotation,
+      lowerLeg.rotation,
+      foot.rotation,
+      torso.position.y
+    ];
+  }
+}
+
+class _JumpingJackPart extends Sprite {
+  _JumpingJackPart(Texture texture, this.pivotPosition) : super(texture);
+  final Point pivotPosition;
+
+  void setPivotAndPosition(Point newPosition) {
+    pivot = new Point(pivotPosition.x / 1024.0, pivotPosition.y / 1024.0);
+    position = newPosition;
+
+    for (Node child in children) {
+      _JumpingJackPart subPart = child;
+      subPart.setPivotAndPosition(
+        new Point(
+          subPart.pivotPosition.x - pivotPosition.x,
+          subPart.pivotPosition.y - pivotPosition.y
+        )
+      );
+    }
+  }
+}
diff --git a/examples/material_gallery/lib/gallery/home.dart b/examples/material_gallery/lib/gallery/home.dart
index bf80312523..5d1e07f60c 100644
--- a/examples/material_gallery/lib/gallery/home.dart
+++ b/examples/material_gallery/lib/gallery/home.dart
@@ -30,6 +30,7 @@ import '../demo/time_picker_demo.dart';
 import '../demo/two_level_list_demo.dart';
 import '../demo/typography_demo.dart';
 import '../demo/weathers_demo.dart';
+import '../demo/fitness_demo.dart';
 
 class GalleryHome extends StatefulComponent {
   GalleryHome({ Key key }) : super(key: key);
@@ -65,7 +66,8 @@ class GalleryHomeState extends State<GalleryHome> {
                   image: 'assets/section_animation.png',
                   colors: Colors.purple,
                   demos: <GalleryDemo>[
-                    new GalleryDemo(title: 'Weathers', builder: () => new WeathersDemo())
+                    new GalleryDemo(title: 'Weathers', builder: () => new WeathersDemo()),
+                    new GalleryDemo(title: 'Fitness', builder: () => new FitnessDemo())
                   ]
                 ),
                 new GallerySection(